Difference between revisions of "Firefox tweaks"

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[[Category:Web browser]]
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[[ja:Firefox 設定]]
 
[[tr:Firefox İpuçları]]
 
[[tr:Firefox İpuçları]]
[[Category:Web Browser]]
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{{Related articles start}}
{{Article summary start}}
+
{{Related|Firefox}}
{{Article summary text|This page contains advanced Firefox configuration options and performance tweaks.}}
+
{{Related|Browser plugins}}
{{Article summary heading|Related}}
+
{{Related|Firefox on RAM}}
{{Article summary wiki|Firefox}}
+
{{Related|Firefox privacy}}
{{Article summary wiki|Browser Plugins}}
+
{{Related articles end}}
{{Article summary wiki|Firefox Ramdisk}}
+
 
{{Article summary end}}
+
This page contains advanced Firefox configuration options and performance tweaks.
  
 
== Performance ==
 
== Performance ==
Line 13: Line 15:
 
Improving Firefox's performance is divided into parameters that can be inputted while running Firefox or otherwise modifying its configuration as intended by the developers, and advanced procedures that involve foreign programs or scripts.
 
Improving Firefox's performance is divided into parameters that can be inputted while running Firefox or otherwise modifying its configuration as intended by the developers, and advanced procedures that involve foreign programs or scripts.
  
{{Note|Always use the latest version of Firefox.}}
+
{{Note|Listed options may only be available for the latest version of Firefox.}}
  
 
=== Advanced Firefox options ===
 
=== Advanced Firefox options ===
This section contains advanced Firefox options for performance tweaking. For additional information see [http://forums.mozillazine.org/viewtopic.php?t=53650 this Mozillazine forum post].
+
This section contains advanced Firefox options for performance tweaking. For additional information see [http://kb.mozillazine.org/Category:Tweaking_preferences these Mozillazine forum posts].
 +
 
 +
==== Enable OpenGL Off-Main-Thread Compositing (OMTC) ====
 +
 
 +
{{Warning|If OpenGL OMTC is disabled for a specific hardware, it may be due to stability issues, high system resources consumption, driver bugs or a number of different variables. Proceed with force-enabling it at your own risk.}}
 +
{{Note|Since Firefox version 40 basic software OMTC is enabled by default.}}
 +
 
 +
To check if OpenGL OMTC is enabled, go to {{ic|about:support}} and under the "Graphics" section look for "GPU Accelerated Windows". If it reports "0/1 Basic (OMTC)" (possibly 0/2), OpenGL OMTC is disabled; if it reports "1/1 OpenGL (OMTC)" (possibly 1/2 or 2/2) it is enabled.
 +
 
 +
To enable OpenGL OMTC go to {{ic|about:config}} and set:
 +
* {{ic|layers.acceleration.force-enabled true}}
 +
* {{ic|layers.offmainthreadcomposition.enabled true}} (default)
 +
 
 +
Restart Firefox for changes to take effect.
 +
If the above changes do not enable GPU acceleration, try setting the environment variable as follows: {{ic|1=export MOZ_USE_OMTC=1|2==}}. Then run Firefox [http://featherweightmusings.blogspot.se/2013/11/no-more-main-thread-opengl-in-firefox.html].
 +
 
 +
For more information on OMTC in Firefox read here: https://wiki.mozilla.org/Platform/GFX/OffMainThreadCompositing
  
 
==== Network settings ====
 
==== Network settings ====
Line 22: Line 40:
 
Advanced network settings can be found on the {{ic|about:config}} page (try searching for ''network'').
 
Advanced network settings can be found on the {{ic|about:config}} page (try searching for ''network'').
  
{| class="wikitable" border="1" style="width: 100%;" cellpadding="5" cellspacing="0"
+
{| class="wikitable"
|+ Recommended values for a 1.5Mb connection
+
|+ Suggested values
 
! Key || Value || Description
 
! Key || Value || Description
 
|-
 
|-
Line 29: Line 47:
 
|-
 
|-
 
| network.http.proxy.pipelining || true || Enable pipelining for proxy connections
 
| network.http.proxy.pipelining || true || Enable pipelining for proxy connections
|-
 
| network.http.pipelining.maxrequests || 8 || Maximum HTTP requests per pipeline
 
|-
 
| network.http.max-connections || 64 || Maximum number of total HTTP connections
 
|-
 
| network.http.max-connections-per-server || 16 || Maximum number of any type of connections per server
 
|-
 
| network.http.max-persistent-connections-per-proxy || 16 || Maximum number of keep-alive type connections per proxy
 
|-
 
| network.http.max-persistent-connections-per-server || 8 || Maximum number of keep-alive type connections per server
 
|-
 
| network.dns.disableIPv6 || true || Disable IPv6 support
 
 
|}
 
|}
 
{{Note|These settings need to be configured based on your connection.}}
 
  
 
==== Turn off anti-phishing ====
 
==== Turn off anti-phishing ====
 
{{Note|Deleting files from your profile folder is potentially dangerous, so it is recommended that you back it up first.}}
 
{{Note|Deleting files from your profile folder is potentially dangerous, so it is recommended that you back it up first.}}
  
The anti-phishing features of Firefox may cause Firefox to become slow to start or exit. The problem is that Firefox maintains an [[Sqlite]] database that can grow quite big which makes reading and writing slower after repeated use. If you feel that you do not need Firefox to tell you which sites may be suspect you can disable this feature:
+
The anti-phishing features of Firefox may cause Firefox to become slow to start or exit. The problem is that Firefox maintains an [[SQLite]] database that can grow quite big which makes reading and writing slower after repeated use. If you feel that you do not need Firefox to tell you which sites may be suspect you can disable this feature:
  
 
* Turn off the following options under the security tab in preferences: ''"Block reported attack sites"'' and ''"Block reported web forgeries"''.
 
* Turn off the following options under the security tab in preferences: ''"Block reported attack sites"'' and ''"Block reported web forgeries"''.
Line 55: Line 59:
 
  $ rm -i ~/.mozilla/firefox/<profile_dir>/urlclassifier*
 
  $ rm -i ~/.mozilla/firefox/<profile_dir>/urlclassifier*
  
:Some of these files might be recreated by Firefox, but they won't grow any larger than their initial size.
+
:Some of these files might be recreated by Firefox, but they will not grow any larger than their initial size.
  
 
==== Stop urlclassifier3.sqlite from being created again ====
 
==== Stop urlclassifier3.sqlite from being created again ====
Line 66: Line 70:
 
This effectively makes the file empty and then read-only so Firefox cannot write to it anymore.
 
This effectively makes the file empty and then read-only so Firefox cannot write to it anymore.
  
==== Improve font rendering by disabling pango ====
+
==== Turn off OCSP validation ====
 +
OCSP validation may cause Firefox [http://news.netcraft.com/archives/2013/04/16/certificate-revocation-and-the-performance-of-ocsp.html to become slower] for each (HTTPS) connection to a new server. This is worse, recently, where web gadgets are included in pages via HTTPS (e.g., "like" buttons of the social networks), resulting in many connections for a single URL.
  
To disable [http://www.pango.org/ Pango] font handling in Firefox, add:
+
* Turn off the following option under Preferences -> Advanced -> Certificates -> ''"Requests: Use the Online Certificate Status Protocol (OCSP) to confirm the current validity of certificates"''.
  
export MOZ_DISABLE_PANGO=1
+
{{Warning|Disabling OCSP causes vulnerabilities to man-in-the-middle attacks. If you are using a potentially vulnerable connection such as Wi-Fi or VPN, it is strongly advised to leave OCSP on.}}
  
to the {{ic|~/.profile}} or to {{ic|/etc/profile}} or to a shell configuration file (e.g. {{ic|.bashrc}}) and re-login for the change to take place.
+
==== Turn off the disk cache ====
 +
Every object loaded (html pages, jpeg images, css stylesheets, gif banners) is saved in the Firefox cache, to be loaded in the future without to download it again from the server, but only fraction of these objects will be really reused without download (usually the 30%). This because of too short expiration times for the objects, updates or simply the user behavior (to load new pages instead the ones already visited). The Firefox cache is divided in memory and disk cache and using the disk cache results to frequent disk writes, because every time an object loaded it is written to the disk and some older object is removed.
  
{{note|Exporting the setting may also fix font issues for the entire Mozilla suite.}}
+
* Turn on the following option under Preferences -> Advanced -> Network -> ''"Cached Web Content: Override automatic cache management"'' and specify zero in ''"Limit cache to"''.
 +
 
 +
==== Longer interval to save session ====
 +
The Firefox session store automatically saves the current status (opened urls, cookies, history and bookmarks) to the disk every 15 seconds. It may be too frequent for the user needs, resulting in a frequent disk access.
 +
 
 +
This setting can be found on the {{ic|about:config}} page (try searching for ''sessionstore'').
 +
 
 +
* browser.sessionstore.interval 300000
 +
 
 +
==== Immediate rendering of pages ====
 +
Mozilla applications render web pages incrementally - they display what has been received of a page before the entire page has been downloaded. Since the start of a web page normally does not have much useful information to display, Mozilla applications will wait a short interval before first rendering a page. This preference controls that interval. Note that if you are on slower connections (dial up) changing this setting might make web pages load for longer times even though the page appears faster.
 +
 
 +
This setting can be created in the {{ic|about:config}} page as
 +
 
 +
* nglayout.initialpaint.delay with a value of 0.
  
 
=== Other modifications ===
 
=== Other modifications ===
 
This section contains some other modifications that may increase Firefox's performance.
 
This section contains some other modifications that may increase Firefox's performance.
  
==== Reduce load time by compressing the Firefox binary with UPX ====
+
==== Enable firefox optional tracking protection ====
[http://upx.sourceforge.net/ UPX] is an executable packer that supports very fast decompression and induces no memory overhead. It can be [[pacman|installed]] with the {{Pkg|upx}} package, availalble in the [[official repositories]].
+
Firefox gained an option for [https://support.mozilla.org/en-US/kb/tracking-protection-firefox tracking protection]. It can be enabled by setting {{ic|about:config}}:
  
Before using {{ic|upx}} to compress the Firefox executable, make a backup of the binary:
+
* privacy.trackingprotection.enabled  true
# cp /usr/lib/firefox/firefox /usr/lib/firefox/firefox.backup
+
  
Finally, invoke {{ic|upx}}, applying the best possible compression level:
+
Apart from privacy benefits, enabling [http://venturebeat.com/2015/05/24/firefoxs-optional-tracking-protection-reduces-load-time-for-top-news-sites-by-44/ tracking protection] may also reduce load time by 44%.
# upx --best /usr/lib/firefox/firefox
+
 
 +
==== Referer header control ====
 +
Firefox as of version 28 has the ability to control how the HTTP Referer header is send. The options are hidden from the GUI configuration, but available through {{ic|about:config}}. There are [http://security.stackexchange.com/a/80194 four related keys]. The source post mentions recommended and default settings. A short description of the recommended setting is given in table, as well as the values to achieve a perfect score on [https://ip-check.info ip-check.info].
 +
 
 +
{| class="wikitable"
 +
|+ Suggested values
 +
! Key || Recommended || [https://ip-check.info ip-check.info] || Default || Description
 +
|-
 +
| network.http.sendRefererHeader || 1 || 1 ||  2 || Only for clicked links (0 disabled completely, 1 send referer on link click, 2 always send; incl. images)
 +
|-
 +
| network.http.referer.XOriginPolicy || 1 || 1 || 0 || Only if base domains match (0 always send, 2 only if host matches)
 +
|-
 +
| network.http.referer.spoofSource || true || false || false || Send target URI instead
 +
|-
 +
| network.http.referer.trimmingPolicy || 2 || 0 || 0 || scheme, host and port (0 full; 1 scheme, host port and path)
 +
|}
  
 
==== Defragment the profile's SQLite databases ====
 
==== Defragment the profile's SQLite databases ====
Line 93: Line 127:
 
In Firefox 3.0, bookmarks, history, passwords are kept in an SQLite databases. SQLite databases become fragmented over time and empty spaces appear all around. But, since there are no managing processes checking and optimizing the database, these factors eventually result in a performance hit. A good way to improve start-up and some other bookmarks and history related tasks is to defragment and trim unused space from these databases.
 
In Firefox 3.0, bookmarks, history, passwords are kept in an SQLite databases. SQLite databases become fragmented over time and empty spaces appear all around. But, since there are no managing processes checking and optimizing the database, these factors eventually result in a performance hit. A good way to improve start-up and some other bookmarks and history related tasks is to defragment and trim unused space from these databases.
  
{{AUR|profile-cleaner}} in the [[AUR]] does just this.
+
{{AUR|profile-cleaner}} does just this.
  
{| class="wikitable" border="1" style="width: 100%;" cellpadding="5" cellspacing="0"
+
{| class="wikitable"
 
|+ Sample size differences comparison
 
|+ Sample size differences comparison
 
! SQLite database || Size Before || Size After || % change
 
! SQLite database || Size Before || Size After || % change
Line 106: Line 140:
  
 
==== Cache the entire profile into RAM via tmpfs ====
 
==== Cache the entire profile into RAM via tmpfs ====
If the system has memory to spare, {{ic|tmpfs}} can be used to [[Firefox Ramdisk|cache the entire profile directory]], which might result in increased Firefox responsiveness.
+
If the system has memory to spare, {{ic|tmpfs}} can be used to [[Firefox on RAM|cache the entire profile directory]], which might result in increased Firefox responsiveness.
 +
 
 +
==== Turn off sponsored content and tiles ====
 +
In {{ic|about:config}}, set the string value to a blank for both of these: {{ic|browser.newtabpage.directory.source}} and {{ic|browser.newtabpage.directory.ping}}. Consider also disabling the tile feature from the tools on a new tab page. A [[Wireshark]] session demonstrates the level of chatter created by these features.
  
 
== Appearance ==
 
== Appearance ==
 
=== Fonts ===
 
=== Fonts ===
{{Box||See the main article: [[Font Configuration]]|#E5E5FF|#FCFCFC}}
+
See the main article: [[Font configuration]]
  
 
==== Configure the DPI value ====
 
==== Configure the DPI value ====
 
Modifying the following value can help improve the way fonts looks in Firefox if the system's DPI is below 96.  Firefox, by default, uses 96 and only uses the system's DPI if it is a higher value. To force the system's DPI regardless of its value, type {{ic|about:config}} into the address bar and set {{ic|layout.css.dpi}} to '''0'''.
 
Modifying the following value can help improve the way fonts looks in Firefox if the system's DPI is below 96.  Firefox, by default, uses 96 and only uses the system's DPI if it is a higher value. To force the system's DPI regardless of its value, type {{ic|about:config}} into the address bar and set {{ic|layout.css.dpi}} to '''0'''.
  
In [[Xfce]], the above method only affects the Firefox user interface's DPI settings, but web page contents still use a DPI value of 96, which may look ugly. A solution is to change {{ic|layout.css.devPixelsPerPx}} to system's DPI divided by 96. For example, if your system's DPI is 142, then the value to add is 142/96 = 1.48. Changing {{ic|layout.css.devPixelsPerPx}} to '''1.48''' makes web page contents use a DPI of 142, which looks much better.
+
Note that the above method only affects the Firefox user interface's DPI settings. Web page contents still use a DPI value of 96, which may look ugly or, in the case of high-resolution displays, may be rendered too small to read. A solution is to change {{ic|layout.css.devPixelsPerPx}} to system's DPI divided by 96. For example, if your system's DPI is 144, then the value to add is 144/96 = 1.5. Changing {{ic|layout.css.devPixelsPerPx}} to '''1.5''' makes web page contents use a DPI of 144, which looks much better.
 +
 
 +
See also [[HiDPI#Firefox]] for information about HiDPI displays.
  
 
==== Default font settings from Microsoft Windows ====
 
==== Default font settings from Microsoft Windows ====
Line 129: Line 168:
 
Firefox's user interface can be modified by editing the {{ic|userChrome.css}} and {{ic|userContent.css}} files in {{ic|~/.mozilla/firefox/<profile_dir>/chrome/}} (''profile_dir'' is of the form ''hash.name'', where the ''hash'' is an 8 character, seemingly random string and the profile ''name'' is usually ''default'').
 
Firefox's user interface can be modified by editing the {{ic|userChrome.css}} and {{ic|userContent.css}} files in {{ic|~/.mozilla/firefox/<profile_dir>/chrome/}} (''profile_dir'' is of the form ''hash.name'', where the ''hash'' is an 8 character, seemingly random string and the profile ''name'' is usually ''default'').
  
{{Note|The {{ic|chrome/}} folder and {{ic|userChrome.css}}/{{ic|userContent.css}} files may not necessarily exist, so you have to create them.}}
+
{{Note|The {{ic|chrome/}} folder and {{ic|userChrome.css}}/{{ic|userContent.css}} files may not necessarily exist, so they may need to be created.}}
  
 
This section only deals with the {{ic|userChrome.css}} file which modifies Firefox's user interface, and not web pages.
 
This section only deals with the {{ic|userChrome.css}} file which modifies Firefox's user interface, and not web pages.
Line 207: Line 246:
 
}
 
}
 
}}
 
}}
 +
 +
==== Hide window border and title bar ====
 +
Install the [https://addons.mozilla.org/firefox/addon/hide-caption-titlebar-plus-sma/ Hide Caption Titlebar Plus] extension and set the following settings (leaving other settings to default):
 +
{| class="wikitable"
 +
! Option
 +
! Value
 +
|-
 +
| Show Custom Caption/TitleBar
 +
| Never
 +
|-
 +
| Activate custom borders and corner resizers
 +
| Deactivate
 +
|-
 +
| Enable Customizable Buttons (min,max,close)
 +
| Using a Glass-like window background
 +
|-
 +
| Custom Minimize, Max, Close Buttons
 +
| Auto. Current theme's skin (fixed position)
 +
|-
 +
| Drag Fx window using Tab-bar background
 +
| Enable
 +
|-
 +
| Alternative hide-titlebar feature
 +
| Use
 +
|}
 +
 +
The extension [https://addons.mozilla.org/firefox/addon/classicthemerestorer/ Classic Theme Restorer] provides more tweaking options to get the best result (e.g. set tab height to 28px, enable/disable toolbars/buttons, etc.).
  
 
==== Auto-hide Bookmarks Toolbar ====
 
==== Auto-hide Bookmarks Toolbar ====
Line 229: Line 295:
  
 
=== Web content CSS settings ===
 
=== Web content CSS settings ===
This section deals with the {{ic|userContent.css}} files in which you can add custom CSS rules for web content. You can import other CSS files by adding to the file:
+
This section deals with the {{ic|userContent.css}} file in which you can add custom CSS rules for web content. Changes to this file will take effect once the browser is restarted.
 +
 
 +
This file can be used for making small fixes or to apply personal styles to frequently visited websites. Custom stylesheets for popular websites are available from sources such as [http://userstyles.org/ userstyles.org]. You can install an add-on such as [https://addons.mozilla.org/firefox/addon/superusercontent/ superUserContent] to manage themes. This add-on creates the directory {{ic|chrome/userContent.css.d}} and applies changes to the CSS files therein when the page is refreshed.
  
 +
==== Import other CSS files ====
 
{{hc|~/.mozilla/firefox/<profile_dir>/chrome/userContent.css|
 
{{hc|~/.mozilla/firefox/<profile_dir>/chrome/userContent.css|
 
@import url("./imports/some_file.css");
 
@import url("./imports/some_file.css");
Line 253: Line 322:
 
}}
 
}}
  
==== Show URLs at the bottom of the screen when hovering a link ====
+
==== Firefox 4 New Menu Bar/Firefox Button ====
{{hc|~/.mozilla/firefox/<profile_dir>/chrome/userContent.css|
+
To toggle between the new Firefox button and the classic menu bar:
a[href]:hover {
+
* if the button is active, check ''Preferences > Menu Bar'', or right click in the toolbar area and check ''Menu Bar''.
    text-decoration: none !important;
+
* if the menu bar is active, uncheck ''View > Toolbars > Menu Bar'', or right click in the toolbar area and uncheck ''Menu Bar''.
 +
 
 +
In GNU/Linux, you will just get a plain grey button instead of the new orange one from Windows. However you can change this to either a Firefox icon or the icon followed by the "Firefox" text.
 +
 
 +
Adding the following to your {{ic|~/.mozilla/firefox/userprofile/chrome/userChrome.css}} file will place the icon before the text:
 +
{{bc|
 +
#appmenu-toolbar-button {
 +
  list-style-image: url("chrome://branding/content/icon16.png");
 
}
 
}
 +
}}
  
a[href]:hover:after {
+
Adding the following to the same file will ''remove'' the "Firefox" text:
    content: attr(href);
+
{{bc|
    position: fixed; left: 0px; bottom: 0px;
+
#appmenu-toolbar-button > .toolbarbutton-text,
    padding: 0 2px !important;
+
#appmenu-toolbar-button > .toolbarbutton-menu-dropmarker {
    max-width: 95%; overflow: hidden;
+
  display: none !important;
    white-space: nowrap; text-overflow: ellipsis;
+
}
    font:10pt sans-serif !important;
+
    background-color: black  !important;
+
    color: white !important;
+
    opacity: 0.7;
+
    z-index: 9999;
+
}</nowiki>
+
 
}}
 
}}
 +
 +
This userChrome.css configuration copies the default Windows Firefox 4+ look and adds an orange background to the button, with a purple background in Private Browsing mode:
 +
{{bc|
 +
#main-window:not([privatebrowsingmode]) #appmenu-toolbar-button {
 +
    -moz-appearance: none !important;
 +
    color: #FEEDFC !important;
 +
    background: -moz-linear-gradient(hsl(34,85%,60%), hsl(26,72%,53%) 95%) !important;
 +
    border: 1px solid #000000 !important;
 +
}
 +
 +
#main-window:not([privatebrowsingmode]) #appmenu-toolbar-button:hover:not(:active):not([open]) {
 +
    -moz-appearance: none !important;
 +
    color: #FEEDFC !important;
 +
    background: -moz-linear-gradient(hsl(26,72%,53%), hsl(34,85%,60%) 95%) !important;
 +
    border: 1px solid #000000 !important;
 +
}
 +
 +
 +
#main-window:not([privatebrowsingmode]) #appmenu-toolbar-button:hover:active,
 +
#main-window:not([privatebrowsingmode]) #appmenu-toolbar-button[open] {
 +
    -moz-appearance: none !important;
 +
    color: #FEEDFC !important;
 +
    background: -moz-linear-gradient(hsl(26,72%,53%), hsl(26,72%,53%) 95%) !important;
 +
    border: 1px solid #000000 !important;
 +
}
 +
 +
#appmenu-toolbar-button {
 +
    -moz-appearance: none !important;
 +
    color: #FEEDFC !important;
 +
    background: -moz-linear-gradient(hsl(279,70%,46%), hsl(276,75%,38%) 95%) !important;
 +
    border: 1px solid #000000 !important;
 +
}
 +
 +
 +
#main-window #appmenu-toolbar-button:hover:not(:active):not([open]) {
 +
    -moz-appearance: none !important;
 +
    color: #FEEDFC !important;
 +
    background: -moz-linear-gradient(hsl(276,75%,38%), hsl(279,70%,46%) 95%) !important;
 +
    border: 1px solid #000000 !important;
 +
}
 +
 +
 +
#main-window #appmenu-toolbar-button:hover:active,
 +
#main-window #appmenu-toolbar-button[open] {
 +
    -moz-appearance: none !important;
 +
    color: #FEEDFC !important;
 +
    background: -moz-linear-gradient(hsl(276,75%,38%), hsl(276,75%,38%) 95%) !important;
 +
    border: 1px solid #000000 !important;
 +
}
 +
}}
 +
 +
{{Note|You need to create both the {{ic|chrome}} directory and {{ic|userChrome.css}}, if they do not already exist.}}
  
 
==== Block ads ====
 
==== Block ads ====
Line 280: Line 403:
  
 
Other tips and tweaks.
 
Other tips and tweaks.
 +
 +
=== Enable additional media codecs ===
 +
 +
{{Expansion|This section is not completed, there are many other variables related to Media Codecs in firefox.}}
 +
 +
Before continuing, remember there is a reason some of these variables are not enabled by default, e.g. stability, memory leaks, etc. Go to {{ic|about:config}} and check the following options:
 +
 +
{| class="wikitable"
 +
|+ Suggested values
 +
! Key || Value || Description
 +
|-
 +
| media.mediasource.enabled || true (default) || Enable [[wikipedia:Media_Source_Extensions|Media Source Extensions]] (MSE)
 +
|-
 +
| media.mediasource.mp4.enabled || true (default) || Enable [[wikipedia:MPEG-4_Part_14|MP4]] MSE
 +
|-
 +
| media.mediasource.webm.enabled || true (default) || Enable [[wikipedia:WebM|WebM]] MSE. If you use Youtube see [[#WebM and Youtube|WebM and Youtube]].
 +
|-
 +
| media.fragmented-mp4.exposed || true || Enable fragmented MP4 segments
 +
|-
 +
| media.fragmented-mp4.ffmpeg.enabled || true || Enable fragmented MP4 ffmpeg
 +
|-
 +
| media.mediasource.ignore_codecs || true || Enable H.264 MSE, amongst other things (This boolean key has to be created!)
 +
|}
 +
 +
==== WebM and Youtube ====
 +
 +
If WebM MSE is enabled when Youtube is set to use the HTML5 player by default, Youtube will use [[wikipedia:VP9|VP9]] video by default to save bandwidth. However, hardware acceleration is not available for VP9, if you want to use hardware acceleration with youtube video especially if you have less capable hardware consider setting {{ic|media.mediasource.webm.enabled}} to false to make youtube stream H.264 video for which hardware acceleration is widely available.
 +
 +
To verify if WebM (VP9) is enabled go to [https://youtube.com/html5 youtube.com/html5]. If "MSE & WebM VP9" is not supported, youtube will use H264.
  
 
=== Mouse wheel scroll speed ===
 
=== Mouse wheel scroll speed ===
Line 299: Line 451:
  
 
Go to ''Preferences > Applications'' and search for ''Word Document'' (or ''Word 2007 Document'' for {{ic|*.docx}}). After finding it, click the drop-down list and select ''Use other...''. From there you have to specify the exact path to the Abiword or Writer executable (i.e.{{ic|/usr/bin/abiword}} or {{ic|/usr/bin/lowriter}}).
 
Go to ''Preferences > Applications'' and search for ''Word Document'' (or ''Word 2007 Document'' for {{ic|*.docx}}). After finding it, click the drop-down list and select ''Use other...''. From there you have to specify the exact path to the Abiword or Writer executable (i.e.{{ic|/usr/bin/abiword}} or {{ic|/usr/bin/lowriter}}).
 +
 +
=== "I'm Feeling Lucky" mode ===
 +
 +
Some search engines have a "feeling lucky" feature. For example, Google has "I'm Feeling Lucky", and DuckDuckGo has "I'm Feeling Ducky".
 +
 +
To activate them:
 +
# Type {{ic|about:config}} in the address bar.
 +
# Search for the string {{ic|keyword.url}}.
 +
# Modify its value (if any) to the URL of the search engine.
 +
 +
For Google, set it to:
 +
{{bc|<nowiki>https://www.google.com/search?btnI=I%27m+Feeling+Lucky&q=</nowiki>}}
 +
For DuckDuckGo, set it to:
 +
{{bc|<nowiki>https://duckduckgo.com/?q=\</nowiki>}}
  
 
=== Secure DNS with DNSSEC validator ===
 
=== Secure DNS with DNSSEC validator ===
Line 309: Line 475:
  
 
The next time you open a magnet link, you will be prompted with a {{ic|Launch Application}} dialogue. From there simply select your chosen torrent client. This technique can also be used with other protocols.
 
The next time you open a magnet link, you will be prompted with a {{ic|Launch Application}} dialogue. From there simply select your chosen torrent client. This technique can also be used with other protocols.
 +
 +
=== Adding magnet protocol association for kTorrent (KDE4) ===
 +
 +
Create a user copy of {{ic|/usr/share/applications/kde4/ktorrent.desktop}} to {{ic|~/.local/share/applications/kde4/}}, and append to {{ic|1=Mimetype=}}
 +
 +
x-scheme-handler/magnet
 +
 +
Modify {{ic|~/.config/mimeapps.list}} and append:
 +
 +
x-scheme-handler/magnet=kde4-ktorrent.desktop
 +
 +
See [http://superuser.com/questions/44072/how-do-i-associate-magnet-links-with-ktorrent-in-firefox]
  
 
=== Prevent accidental closing ===
 
=== Prevent accidental closing ===
  
The [https://addons.mozilla.org/en-us/firefox/addon/disable-ctrl-q-shortcut/ Disable Ctrl-Q Shortcut] extension can be installed to prevent unwanted closing of the browser.
+
The [https://addons.mozilla.org/firefox/addon/disable-ctrl-q-shortcut/ Disable Ctrl-Q Shortcut] extension can be installed to prevent unwanted closing of the browser.
  
 
An alternative is to add a rule in your window manager configuration file. For example in openbox add:
 
An alternative is to add a rule in your window manager configuration file. For example in openbox add:
Line 320: Line 498:
 
     </action>
 
     </action>
 
   </keybind>
 
   </keybind>
in the <keyboard> section of your rc.xml file.
+
in the ''<keyboard>'' section of your {{ic|rc.xml}} file.
 +
{{Note|This will be effective for every application used under a graphic server.}}
 +
 
 +
=== Plugins do not work with latest version ===
 +
 
 +
Due to Arch's bleeding edge nature, there can be some compatibility issues with plugins not working with the latest Firefox install (e.g. [http://5digits.org/pentadactyl/index Pentadactyl]). If possible, try installing the nightly/beta builds available, or see [[Downgrading packages]].
 +
 
 +
[https://addons.mozilla.org/firefox/addon/checkcompatibility/ Disable Add-on Compatibility Checks] plugin should take care of spurious compatibility issues when the plugins get disabled, even though they work just fine with the new version.
 +
 
 +
=== Jerky or choppy scrolling ===
 +
 
 +
Scrolling in Firefox can feel "jerky" or "choppy". A post on [http://forums.mozillazine.org/viewtopic.php?f=8&t=2749475/ MozillaZine] gives settings that work on Gentoo, but reportedly work on Arch Linux as well:
 +
 
 +
# Set  {{ic|mousewheel.min_line_scroll_amount}} to 40
 +
# Set  {{ic|general.smoothScroll}} and {{ic|general.smoothScroll.pages}} to '''false'''
 +
# Set  {{ic|image.mem.min_discard_timeout_ms}} to something really large such as 2100000000 but no more than 2140000000.  Above that number Firefox will not accept your entry and complain with the error code:  "The text you entered is not a number."
 +
# Set  {{ic|image.mem.max_decoded_image_kb}} to at least 512K
 +
 
 +
Now scrolling should flow smoothly.
 +
 
 +
=== WebRTC exposes LAN IP address ===
 +
 
 +
{{warning|This method disables WebRTC.}}
 +
To prevent websites from getting your local IP address via [https://en.wikipedia.org/wiki/WebRTC WebRTC]'s peer-to-peer (and JavaScript), open {{ic|about:config}} and set {{ic|media.peerconnection.enabled}} to '''false''' (or use this [https://addons.mozilla.org/firefox/addon/happy-bonobo-disable-webrtc/ addon]).
 +
 
 +
=== Run Firefox inside an nspawn container ===
 +
 
 +
{{Move|systemd-nspawn|This is potentially useful for any browser, so... move back?}}
 +
 
 +
To run as PID 1
 +
 
 +
  # systemd-nspawn --setenv=DISPLAY=:0 \
 +
              --setenv=XAUTHORITY=~/.Xauthority \
 +
              --bind-ro=$HOME/.Xauthority:/root/.Xauthority \
 +
              --bind=/tmp/.X11-unix \
 +
              -D ~/containers/firefox \
 +
              firefox
 +
 
 +
Else rather boot the container, with systemd ideally setting up your networking with [[systemd-networkd]]:
 +
 
 +
# systemd-nspawn --bind-ro=$HOME/.Xauthority:/root/.Xauthority \
 +
              --bind=/tmp/.X11-unix \
 +
              -D ~/containers/firefox \
 +
              --network-veth -b
 +
 
 +
Once your container is booted, run the Xorg binary like so:
 +
 
 +
# systemd-run -M firefox --setenv=DISPLAY=:0 firefox
 +
 
 +
===Disable 1024-bit Diffie-Hellman primes===
 +
Following [https://freedom-to-tinker.com/blog/haldermanheninger/how-is-nsa-breaking-so-much-crypto/ recent research] it is likely that the NSA has been breaking 1024-bit Diffie-Hellman for some time now. To disable these switch the [https://www.eff.org/deeplinks/2015/10/how-to-protect-yourself-from-nsa-attacks-1024-bit-DH following] settings to '''false''' in {{ic|about:config}}:
 +
 
 +
  security.ssl3.dhe_rsa_aes_128_sha
 +
  security.ssl3.dhe_rsa_aes_256_sha
 +
 
 +
Then consider checking your SSL configuration at https://www.howsmyssl.com/.
 +
 
 +
=== Show search matches position in scroll bar ===
 +
 +
This chrome feature can be achieved via [https://addons.mozilla.org/firefox/addon/findbar-tweak/ FindBar Tweak] extension.
  
 
== See also ==
 
== See also ==
Line 326: Line 563:
 
* [http://kb.mozillazine.org/Knowledge_Base MozillaZine Wiki]
 
* [http://kb.mozillazine.org/Knowledge_Base MozillaZine Wiki]
 
* [http://kb.mozillazine.org/About:config_entries about:config Entries Explained]
 
* [http://kb.mozillazine.org/About:config_entries about:config Entries Explained]
* [http://linuxtidbits.wordpress.com/2009/08/01/better-fox-cat-and-weasel/ Top Fox: Completing the Feel of Firefox]
+
* [http://linuxtidbits.wordpress.com/2009/08/01/better-fox-cat-and-weasel/ Firefox touch-ups that might be desired]
* [http://linuxtidbits.wordpress.com/2013/03/08/firefox-defining-font-type-and-size/ Firefox: Defining font type and size]
+

Latest revision as of 15:01, 17 July 2016

This page contains advanced Firefox configuration options and performance tweaks.

Contents

Performance

Improving Firefox's performance is divided into parameters that can be inputted while running Firefox or otherwise modifying its configuration as intended by the developers, and advanced procedures that involve foreign programs or scripts.

Note: Listed options may only be available for the latest version of Firefox.

Advanced Firefox options

This section contains advanced Firefox options for performance tweaking. For additional information see these Mozillazine forum posts.

Enable OpenGL Off-Main-Thread Compositing (OMTC)

Warning: If OpenGL OMTC is disabled for a specific hardware, it may be due to stability issues, high system resources consumption, driver bugs or a number of different variables. Proceed with force-enabling it at your own risk.
Note: Since Firefox version 40 basic software OMTC is enabled by default.

To check if OpenGL OMTC is enabled, go to about:support and under the "Graphics" section look for "GPU Accelerated Windows". If it reports "0/1 Basic (OMTC)" (possibly 0/2), OpenGL OMTC is disabled; if it reports "1/1 OpenGL (OMTC)" (possibly 1/2 or 2/2) it is enabled.

To enable OpenGL OMTC go to about:config and set:

  • layers.acceleration.force-enabled true
  • layers.offmainthreadcomposition.enabled true (default)

Restart Firefox for changes to take effect. If the above changes do not enable GPU acceleration, try setting the environment variable as follows: export MOZ_USE_OMTC=1. Then run Firefox [1].

For more information on OMTC in Firefox read here: https://wiki.mozilla.org/Platform/GFX/OffMainThreadCompositing

Network settings

Advanced network settings can be found on the about:config page (try searching for network).

Suggested values
Key Value Description
network.http.pipelining true Enable pipelining for normal connections
network.http.proxy.pipelining true Enable pipelining for proxy connections

Turn off anti-phishing

Note: Deleting files from your profile folder is potentially dangerous, so it is recommended that you back it up first.

The anti-phishing features of Firefox may cause Firefox to become slow to start or exit. The problem is that Firefox maintains an SQLite database that can grow quite big which makes reading and writing slower after repeated use. If you feel that you do not need Firefox to tell you which sites may be suspect you can disable this feature:

  • Turn off the following options under the security tab in preferences: "Block reported attack sites" and "Block reported web forgeries".
  • Delete all files beginning with urlclassifier in your profile folder (~/.mozilla/firefox/<profile_dir>/):
$ rm -i ~/.mozilla/firefox/<profile_dir>/urlclassifier*
Some of these files might be recreated by Firefox, but they will not grow any larger than their initial size.

Stop urlclassifier3.sqlite from being created again

If you did remove all the urlclassifier* files as mentioned above, you may find out that urlclassifier3.sqlite keeps growing again after a certain time. Here is a simple solution to avoid it for now and ever.

$ cd ~/.mozilla/firefox/<profile_dir>
$ echo "" > urlclassifier3.sqlite
$ chmod 400 urlclassifier3.sqlite

This effectively makes the file empty and then read-only so Firefox cannot write to it anymore.

Turn off OCSP validation

OCSP validation may cause Firefox to become slower for each (HTTPS) connection to a new server. This is worse, recently, where web gadgets are included in pages via HTTPS (e.g., "like" buttons of the social networks), resulting in many connections for a single URL.

  • Turn off the following option under Preferences -> Advanced -> Certificates -> "Requests: Use the Online Certificate Status Protocol (OCSP) to confirm the current validity of certificates".
Warning: Disabling OCSP causes vulnerabilities to man-in-the-middle attacks. If you are using a potentially vulnerable connection such as Wi-Fi or VPN, it is strongly advised to leave OCSP on.

Turn off the disk cache

Every object loaded (html pages, jpeg images, css stylesheets, gif banners) is saved in the Firefox cache, to be loaded in the future without to download it again from the server, but only fraction of these objects will be really reused without download (usually the 30%). This because of too short expiration times for the objects, updates or simply the user behavior (to load new pages instead the ones already visited). The Firefox cache is divided in memory and disk cache and using the disk cache results to frequent disk writes, because every time an object loaded it is written to the disk and some older object is removed.

  • Turn on the following option under Preferences -> Advanced -> Network -> "Cached Web Content: Override automatic cache management" and specify zero in "Limit cache to".

Longer interval to save session

The Firefox session store automatically saves the current status (opened urls, cookies, history and bookmarks) to the disk every 15 seconds. It may be too frequent for the user needs, resulting in a frequent disk access.

This setting can be found on the about:config page (try searching for sessionstore).

  • browser.sessionstore.interval 300000

Immediate rendering of pages

Mozilla applications render web pages incrementally - they display what has been received of a page before the entire page has been downloaded. Since the start of a web page normally does not have much useful information to display, Mozilla applications will wait a short interval before first rendering a page. This preference controls that interval. Note that if you are on slower connections (dial up) changing this setting might make web pages load for longer times even though the page appears faster.

This setting can be created in the about:config page as

  • nglayout.initialpaint.delay with a value of 0.

Other modifications

This section contains some other modifications that may increase Firefox's performance.

Enable firefox optional tracking protection

Firefox gained an option for tracking protection. It can be enabled by setting about:config:

  • privacy.trackingprotection.enabled true

Apart from privacy benefits, enabling tracking protection may also reduce load time by 44%.

Referer header control

Firefox as of version 28 has the ability to control how the HTTP Referer header is send. The options are hidden from the GUI configuration, but available through about:config. There are four related keys. The source post mentions recommended and default settings. A short description of the recommended setting is given in table, as well as the values to achieve a perfect score on ip-check.info.

Suggested values
Key Recommended ip-check.info Default Description
network.http.sendRefererHeader 1 1 2 Only for clicked links (0 disabled completely, 1 send referer on link click, 2 always send; incl. images)
network.http.referer.XOriginPolicy 1 1 0 Only if base domains match (0 always send, 2 only if host matches)
network.http.referer.spoofSource true false false Send target URI instead
network.http.referer.trimmingPolicy 2 0 0 scheme, host and port (0 full; 1 scheme, host port and path)

Defragment the profile's SQLite databases

Warning: This procedure may damage the databases in such a way that sessions are not saved properly.

In Firefox 3.0, bookmarks, history, passwords are kept in an SQLite databases. SQLite databases become fragmented over time and empty spaces appear all around. But, since there are no managing processes checking and optimizing the database, these factors eventually result in a performance hit. A good way to improve start-up and some other bookmarks and history related tasks is to defragment and trim unused space from these databases.

profile-cleanerAUR does just this.

Sample size differences comparison
SQLite database Size Before Size After  % change
urlclassifier3.sqlite 37 M 30 M 19 %
places.sqlite 16 M 2.4 M 85 %

Cache the entire profile into RAM via tmpfs

If the system has memory to spare, tmpfs can be used to cache the entire profile directory, which might result in increased Firefox responsiveness.

Turn off sponsored content and tiles

In about:config, set the string value to a blank for both of these: browser.newtabpage.directory.source and browser.newtabpage.directory.ping. Consider also disabling the tile feature from the tools on a new tab page. A Wireshark session demonstrates the level of chatter created by these features.

Appearance

Fonts

See the main article: Font configuration

Configure the DPI value

Modifying the following value can help improve the way fonts looks in Firefox if the system's DPI is below 96. Firefox, by default, uses 96 and only uses the system's DPI if it is a higher value. To force the system's DPI regardless of its value, type about:config into the address bar and set layout.css.dpi to 0.

Note that the above method only affects the Firefox user interface's DPI settings. Web page contents still use a DPI value of 96, which may look ugly or, in the case of high-resolution displays, may be rendered too small to read. A solution is to change layout.css.devPixelsPerPx to system's DPI divided by 96. For example, if your system's DPI is 144, then the value to add is 144/96 = 1.5. Changing layout.css.devPixelsPerPx to 1.5 makes web page contents use a DPI of 144, which looks much better.

See also HiDPI#Firefox for information about HiDPI displays.

Default font settings from Microsoft Windows

Below are the default font preferences when Firefox is installed in Microsoft Windows. Many web sites use the Microsoft fonts.

Proportional: Serif Size (pixels): 16
Serif: Times New Roman
Sans-serif: Arial
Monospace: Courier New Size (pixels): 13

General user interface CSS settings

Firefox's user interface can be modified by editing the userChrome.css and userContent.css files in ~/.mozilla/firefox/<profile_dir>/chrome/ (profile_dir is of the form hash.name, where the hash is an 8 character, seemingly random string and the profile name is usually default).

Note: The chrome/ folder and userChrome.css/userContent.css files may not necessarily exist, so they may need to be created.

This section only deals with the userChrome.css file which modifies Firefox's user interface, and not web pages.

Change the font

The setting effectively overrides the global GTK+ font preferences, and does not affect webpages, only the user interface itself:

~/.mozilla/firefox/<profile_dir>/chrome/userChrome.css
* {
    font-family: "FONT_NAME";
}

Hide button icons

Enables text-only buttons:

~/.mozilla/firefox/<profile_dir>/chrome/userChrome.css
.button-box .button-icon {
    display: none;
}

Hiding various tab buttons

These settings hide the arrows that appear to the horizontal edges of the tab bar, the button that toggles the "all tabs" drop-down list, and the plus sign button that creates a new tab.

~/.mozilla/firefox/<profile_dir>/chrome/userChrome.css
/* Tab bar */

.tabbrowser-strip *[class^="scrollbutton"] {
    /* Hide tab scroll buttons */
    display: none;
}

.tabbrowser-strip *[class^="tabs-alltabs"] {
    /* Hide tab drop-down list */
    display: none;
}

.tabbrowser-strip *[class^="tabs-newtab-button"] {
    /* Hide new-tab button */
    display: none;
}

Horizontal tabs

To place the tab bar horizontally stacked along the sides of the browser window:

~/.mozilla/firefox/<profile_dir>/chrome/userChrome.css
/* Display the tabbar on the left */
#content > tabbox {
    -moz-box-orient: horizontal;
}

.tabbrowser-strip {
    -moz-box-orient: vertical;
    /*
     * You can set this to -moz-scrollbars-vertical instead,
     * but then the scrollbar will *always* be visible.  this way
     * there is never a scrollbar, so it behaves like the tab bar
     * normally does
     */
     overflow: -moz-scrollbars-none;
}

.tabbrowser-tabs {
    -moz-box-orient: horizontal;
    min-width: 20ex;   /* You may want to increase this value */
    -mox-box-pack: start;
    -moz-box-align: start;
}

.tabbrowser-tabs > hbox {
    -moz-box-orient: vertical;
    -moz-box-align: stretch;
    -moz-box-pack: start;
}

.tabbrowser-tabs > hbox > tab {
    -moz-box-align: start;
    -moz-box-orient: horizontal;
}

Hide window border and title bar

Install the Hide Caption Titlebar Plus extension and set the following settings (leaving other settings to default):

Option Value
Show Custom Caption/TitleBar Never
Activate custom borders and corner resizers Deactivate
Enable Customizable Buttons (min,max,close) Using a Glass-like window background
Custom Minimize, Max, Close Buttons Auto. Current theme's skin (fixed position)
Drag Fx window using Tab-bar background Enable
Alternative hide-titlebar feature Use

The extension Classic Theme Restorer provides more tweaking options to get the best result (e.g. set tab height to 28px, enable/disable toolbars/buttons, etc.).

Auto-hide Bookmarks Toolbar

~/.mozilla/firefox/<profile_dir>/chrome/userChrome.css
#PersonalToolbar {
    visibility: collapse !important;
}

#navigator-toolbox:hover > #PersonalToolbar {
    visibility: visible !important;
}

Remove sidebar width restrictions

~/.mozilla/firefox/<profile_dir>/chrome/userChrome.css
/* remove maximum/minimum  width restriction of sidebar */
#sidebar {
    max-width: none !important;
    min-width: 0px !important;
}

Web content CSS settings

This section deals with the userContent.css file in which you can add custom CSS rules for web content. Changes to this file will take effect once the browser is restarted.

This file can be used for making small fixes or to apply personal styles to frequently visited websites. Custom stylesheets for popular websites are available from sources such as userstyles.org. You can install an add-on such as superUserContent to manage themes. This add-on creates the directory chrome/userContent.css.d and applies changes to the CSS files therein when the page is refreshed.

Import other CSS files

~/.mozilla/firefox/<profile_dir>/chrome/userContent.css
@import url("./imports/some_file.css");

Block certain parts of a domain

~/.mozilla/firefox/<profile_dir>/chrome/userContent.css
@-moz-document domain(example.com) {
    div#header {
        background-image: none !important;
    } 
}

Add [pdf] after links to PDF files

~/.mozilla/firefox/<profile_dir>/chrome/userContent.css
/* add '[pdf]' next to links to PDF files */
a[href$=".pdf"]:after {
    font-size: smaller;
    content: " [pdf]";
}

Firefox 4 New Menu Bar/Firefox Button

To toggle between the new Firefox button and the classic menu bar:

  • if the button is active, check Preferences > Menu Bar, or right click in the toolbar area and check Menu Bar.
  • if the menu bar is active, uncheck View > Toolbars > Menu Bar, or right click in the toolbar area and uncheck Menu Bar.

In GNU/Linux, you will just get a plain grey button instead of the new orange one from Windows. However you can change this to either a Firefox icon or the icon followed by the "Firefox" text.

Adding the following to your ~/.mozilla/firefox/userprofile/chrome/userChrome.css file will place the icon before the text:

#appmenu-toolbar-button {
  list-style-image: url("chrome://branding/content/icon16.png");
}

Adding the following to the same file will remove the "Firefox" text:

#appmenu-toolbar-button > .toolbarbutton-text,
#appmenu-toolbar-button > .toolbarbutton-menu-dropmarker {
  display: none !important;
}

This userChrome.css configuration copies the default Windows Firefox 4+ look and adds an orange background to the button, with a purple background in Private Browsing mode:

#main-window:not([privatebrowsingmode]) #appmenu-toolbar-button {
    -moz-appearance: none !important;
    color: #FEEDFC !important;
    background: -moz-linear-gradient(hsl(34,85%,60%), hsl(26,72%,53%) 95%) !important;
    border: 1px solid #000000 !important;
}

#main-window:not([privatebrowsingmode]) #appmenu-toolbar-button:hover:not(:active):not([open]) {
    -moz-appearance: none !important;
    color: #FEEDFC !important;
    background: -moz-linear-gradient(hsl(26,72%,53%), hsl(34,85%,60%) 95%) !important;
    border: 1px solid #000000 !important;
}


#main-window:not([privatebrowsingmode]) #appmenu-toolbar-button:hover:active,
#main-window:not([privatebrowsingmode]) #appmenu-toolbar-button[open] {
    -moz-appearance: none !important;
    color: #FEEDFC !important;
    background: -moz-linear-gradient(hsl(26,72%,53%), hsl(26,72%,53%) 95%) !important;
    border: 1px solid #000000 !important;
}

#appmenu-toolbar-button {
    -moz-appearance: none !important;
    color: #FEEDFC !important;
    background: -moz-linear-gradient(hsl(279,70%,46%), hsl(276,75%,38%) 95%) !important;
    border: 1px solid #000000 !important;
}


#main-window #appmenu-toolbar-button:hover:not(:active):not([open]) {
    -moz-appearance: none !important;
    color: #FEEDFC !important;
    background: -moz-linear-gradient(hsl(276,75%,38%), hsl(279,70%,46%) 95%) !important;
    border: 1px solid #000000 !important;
}


#main-window #appmenu-toolbar-button:hover:active,
#main-window #appmenu-toolbar-button[open] {
    -moz-appearance: none !important;
    color: #FEEDFC !important;
    background: -moz-linear-gradient(hsl(276,75%,38%), hsl(276,75%,38%) 95%) !important;
    border: 1px solid #000000 !important;
}
Note: You need to create both the chrome directory and userChrome.css, if they do not already exist.

Block ads

See floppymoose.com for an example of how to use userContent.css as a basic ad-blocker.

Miscellaneous

Other tips and tweaks.

Enable additional media codecs

Tango-view-fullscreen.pngThis article or section needs expansion.Tango-view-fullscreen.png

Reason: This section is not completed, there are many other variables related to Media Codecs in firefox. (Discuss in Talk:Firefox tweaks#)

Before continuing, remember there is a reason some of these variables are not enabled by default, e.g. stability, memory leaks, etc. Go to about:config and check the following options:

Suggested values
Key Value Description
media.mediasource.enabled true (default) Enable Media Source Extensions (MSE)
media.mediasource.mp4.enabled true (default) Enable MP4 MSE
media.mediasource.webm.enabled true (default) Enable WebM MSE. If you use Youtube see WebM and Youtube.
media.fragmented-mp4.exposed true Enable fragmented MP4 segments
media.fragmented-mp4.ffmpeg.enabled true Enable fragmented MP4 ffmpeg
media.mediasource.ignore_codecs true Enable H.264 MSE, amongst other things (This boolean key has to be created!)

WebM and Youtube

If WebM MSE is enabled when Youtube is set to use the HTML5 player by default, Youtube will use VP9 video by default to save bandwidth. However, hardware acceleration is not available for VP9, if you want to use hardware acceleration with youtube video especially if you have less capable hardware consider setting media.mediasource.webm.enabled to false to make youtube stream H.264 video for which hardware acceleration is widely available.

To verify if WebM (VP9) is enabled go to youtube.com/html5. If "MSE & WebM VP9" is not supported, youtube will use H264.

Mouse wheel scroll speed

To modify the default values (i.e. speed-up) of the mouse wheel scroll speed, go to about:config and search for mousewheel.acceleration. This will show the available options, modifying the following:

  • Set mousewheel.acceleration.start to -1.
  • Set mousewheel.acceleration.factor to the desired number (10 to 20 are common values).

Alternatively you can install the SmoothWheel add-on.

Change the order of search engines in the Firefox Search Bar

To change the order search engines are displayed in:

  • Open the drop-down list of search engines and click Manage Search Engines... entry.
  • Highlight the engine you want to move and use Move Up or Move Down to move it. Alternatively, you can use drag-and-drop.

How to open a *.doc automatically with Abiword or LibreOffice Writer

Go to Preferences > Applications and search for Word Document (or Word 2007 Document for *.docx). After finding it, click the drop-down list and select Use other.... From there you have to specify the exact path to the Abiword or Writer executable (i.e./usr/bin/abiword or /usr/bin/lowriter).

"I'm Feeling Lucky" mode

Some search engines have a "feeling lucky" feature. For example, Google has "I'm Feeling Lucky", and DuckDuckGo has "I'm Feeling Ducky".

To activate them:

  1. Type about:config in the address bar.
  2. Search for the string keyword.url.
  3. Modify its value (if any) to the URL of the search engine.

For Google, set it to:

https://www.google.com/search?btnI=I%27m+Feeling+Lucky&q=

For DuckDuckGo, set it to:

https://duckduckgo.com/?q=\

Secure DNS with DNSSEC validator

You can enable DNSSEC support for safer browsing.

Adding magnet protocol association

In about:config set network.protocol-handler.expose.magnet to false.

The next time you open a magnet link, you will be prompted with a Launch Application dialogue. From there simply select your chosen torrent client. This technique can also be used with other protocols.

Adding magnet protocol association for kTorrent (KDE4)

Create a user copy of /usr/share/applications/kde4/ktorrent.desktop to ~/.local/share/applications/kde4/, and append to Mimetype=

x-scheme-handler/magnet

Modify ~/.config/mimeapps.list and append:

x-scheme-handler/magnet=kde4-ktorrent.desktop

See [2]

Prevent accidental closing

The Disable Ctrl-Q Shortcut extension can be installed to prevent unwanted closing of the browser.

An alternative is to add a rule in your window manager configuration file. For example in openbox add:

 <keybind key="C-q">
   <action name="Execute">
     <execute>false</execute>
   </action>
 </keybind>

in the <keyboard> section of your rc.xml file.

Note: This will be effective for every application used under a graphic server.

Plugins do not work with latest version

Due to Arch's bleeding edge nature, there can be some compatibility issues with plugins not working with the latest Firefox install (e.g. Pentadactyl). If possible, try installing the nightly/beta builds available, or see Downgrading packages.

Disable Add-on Compatibility Checks plugin should take care of spurious compatibility issues when the plugins get disabled, even though they work just fine with the new version.

Jerky or choppy scrolling

Scrolling in Firefox can feel "jerky" or "choppy". A post on MozillaZine gives settings that work on Gentoo, but reportedly work on Arch Linux as well:

  1. Set mousewheel.min_line_scroll_amount to 40
  2. Set general.smoothScroll and general.smoothScroll.pages to false
  3. Set image.mem.min_discard_timeout_ms to something really large such as 2100000000 but no more than 2140000000. Above that number Firefox will not accept your entry and complain with the error code: "The text you entered is not a number."
  4. Set image.mem.max_decoded_image_kb to at least 512K

Now scrolling should flow smoothly.

WebRTC exposes LAN IP address

Warning: This method disables WebRTC.

To prevent websites from getting your local IP address via WebRTC's peer-to-peer (and JavaScript), open about:config and set media.peerconnection.enabled to false (or use this addon).

Run Firefox inside an nspawn container

Tango-go-next.pngThis article or section is a candidate for moving to systemd-nspawn.Tango-go-next.png

Notes: This is potentially useful for any browser, so... move back? (Discuss in Talk:Firefox tweaks#)

To run as PID 1

 # systemd-nspawn --setenv=DISPLAY=:0 \
              --setenv=XAUTHORITY=~/.Xauthority \
              --bind-ro=$HOME/.Xauthority:/root/.Xauthority \
              --bind=/tmp/.X11-unix \
              -D ~/containers/firefox \
              firefox

Else rather boot the container, with systemd ideally setting up your networking with systemd-networkd:

# systemd-nspawn --bind-ro=$HOME/.Xauthority:/root/.Xauthority \
              --bind=/tmp/.X11-unix \
              -D ~/containers/firefox \
              --network-veth -b

Once your container is booted, run the Xorg binary like so:

# systemd-run -M firefox --setenv=DISPLAY=:0 firefox

Disable 1024-bit Diffie-Hellman primes

Following recent research it is likely that the NSA has been breaking 1024-bit Diffie-Hellman for some time now. To disable these switch the following settings to false in about:config:

  security.ssl3.dhe_rsa_aes_128_sha
  security.ssl3.dhe_rsa_aes_256_sha

Then consider checking your SSL configuration at https://www.howsmyssl.com/.

Show search matches position in scroll bar

This chrome feature can be achieved via FindBar Tweak extension.

See also