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Template:Article summary start

Template:Article summary text Template:Article summary heading Template:Article summary wiki: Acquiring and installing plugins such as Flash Template:Article summary wiki: Configuration and modifications Template:Article summary end

Firefox is a popular open-source graphical web browser from Mozilla.


The Template:Package Official package can be found in the [extra] repository and installed with pacman:

# pacman -S firefox

There are a number of language packs available if English is not your preferred language. To see a list of available language packs, try:

$ pacman -Ss firefox-i18n


Firefox is well known for its large library of add-ons which can be used to add new features or modify the behavior of existing features of Firefox. You can find new add-ons or manage installed add-ons with Firefox's "Add-ons Manager."

For a list of popular add-ons, see: Mozilla's add-on list sorted by popularity.


See: Browser Plugins

To find out what plugins are installed/enabled, enter:


in the Firefox address bar. Or go to Addons from the main bar drop downs and select the Plugins tab.

Gnome integration

Install Template:Package AUR from AUR to integrate Firefox 3.6.x with Gnome-keyring.

You can also install Template:Package AUR to get libnotify/notifyOSD integration.

Dictionaries for spell checking

Right click in any text entry field and add the dictionary for the solicited language. Restart firefox, and click in a text entry field again to enable spell checking.

Or get it from pacman:

pacman -Ss hunspell

Adding Firefox search engines

Newer method

Visit and install.

If you want to custom one, take a look at : ~/.mozilla/firefox/xxx.default/searchplugins/ where xxx is you profile id).

Method for root user

Firefox writes search engine files to Template:Filename, which is, by default, readable only by root. This means users cannot add search engines. You can chmod o+w this folder to install a search engine.

To remove search engines, remove the appropriate search engine files in Template:Filename. Next time you start Firefox the engine won't be in the list.


Adds Arch-specific searches (AUR, wiki, forum, etc, as specified by user) to the Firefox search toolbar.

# pacman -S arch-firefox-search

Projects related to Firefox

Firefox derivatives

  • Iceweasel - The name of two different Firefox forks. One was a GNU project; the name of this project has since changed to Icecat. The second is being developed by Debian and is based on 2.0. At the time of writing the AUR only has Icecat.
  • GNU/IceCat - formerly known as GNU IceWeasel, is a web browser distributed by the GNU Project. IceCat, which is made entirely of free software, is a fork of Mozilla Firefox. It is compatible with the GNU/Linux operating system and almost all of Firefox's addons. GNU/IceCat really can fully replace Firefox.
  • Swiftfox - An optimized and processor-specific build of Firefox. Currently available via AUR. It should be noted that, considering Arch Linux has ABS, you could build your own optimized build of Firefox.

Firefox customized for speed

Note: As of Firefox 5, the [extra] package is built with PGO.

Building with Profile-Guided Optimization (PGO) is now available with GCC 4 or newer. A PGO build consists of two passes: a first pass to build instrumented binaries, then a second pass to re-build optimized binaries using profile information gleaned from running the instrumented binaries. The Mozilla build system will run both passes for you, you simply need to provide a script to run the application through some profiling scenarios in between the build passes. TraceMonkey adds native‐code compilation to Mozilla’s JavaScript engine (known as “SpiderMonkey”). It is based on a technique developed at UC Irvine called “trace trees”, and building on code and ideas shared with the Tamarin Tracing project. The net result is a massive speed increase both in the browser chrome and Web‐page content.

XULRunner independent, PGO optimized, 64-bit TraceMonkey
XULRunner independent, PGO optimized, 64-bit TraceMonkey, beta

Experimental versions

Mozilla Firefox customizable web browser (XULRunner independent, PGO optimized, 64-bit TraceMonkey, Dev tree

This package is similar to firefox-pgo and firefox-pgo-beta. The difference is that it will track mozilla-current, the Firefox trunk, via Mercurial.

Mozilla Firefox customizable web browser (XULRunner independent, PGO optimized, 64-bit TraceMonkey, Dev tree, Multithreaded

See Mozilla Electrolysis project Read instructions given by the .install file to enable SMP, and enjoy! Expect this to be very unstable for quite a while

Firefox with better KDE integration

with OpenSUSE patch, integrates better with KDE. OpenSUSE's patch and integration of Firefox with KDE is considered the best by many users.
This plugin uses KDE's KParts to embed file viewers into non-KDE browsers


Firefox 4 New Menu Bar

By default Archlinux shows the classic layout of the menu bar. To activate the new Firefox 4 layout with the "Firefox" button replacing the menu bar, uncheck View -> Toolbars -> Menubar.

In Linux you will get just plain grey button instead of new orange one from Windows. However you can change this to nice Firefox icon, by adding to your Template:Codeline this:

#appmenu-toolbar-button {
  list-style-image: url("chrome://branding/content/icon16.png");
#appmenu-toolbar-button > .toolbarbutton-text,
#appmenu-toolbar-button > .toolbarbutton-menu-dropmarker {
  display: none !important;

NOTE: You may need to create both the chrome directory and userChrome.css if they don't already exist.

Open containing folder problems

Some versions of Firefox insists on using Cervisia (CVS manager) or Gwenview (Image viewer) to open folders using the "Open Containing Folder" option in the Downloads manager while in KDE. An effective fix for this was posted on the Mandriva forums: firefox 'open containing folder' in Gwenview not Dolphin. From the post:



, create a text file and name it:


and put this text in it:


(leave a blank line at the end). This should make "open containing folder" open in Dolphin or your default file manager. Restart Firefox.

Firefox keeps creating ~/Desktop even when I don't want it!

See this forum post.

How to prevent plugins from allowing popups?

Ever wondered why popups appear even though you've blocked them? It seems that Flash plugin can bypass default settings and annoy us with those pesky popups. Fear not, for we can prevent it from doing that.

To get around it:

  1. Type about:config into the Firefox location bar.
  2. Right-click on the page and select New and then Integer.
  3. Name it privacy.popups.disable_from_plugins
  4. Set the value to 2.

The possible values are:

  • 0: Allow all popups from plugins.
  • 1: Allow popups, but limit them to dom.popup_maximum.
  • 2: Block popups from plugins.
  • 3: Block popups from plugins, even on whitelisted sites.

Middle-click errors

! The URL is not valid and cannot be loaded.

Another symptom is that middle-clicking results in unexpected behavior, like accessing a random webpage.

The reason stems from the use of the middle mouse buttons in UNIX-like operating systems. The middle mouse button is used to paste whatever text has been highlighted/added to the clipboard. Then there is the possibly conflicting feature in Firefox, which defaults to loading the url of the corresponding text when the button is depressed. This can be disabled like so:

Open the browser, and type the following into the address bar:


Search for middlemouse.contentLoadURL and set it to false.

Alternatively, having the traditional scroll cursor on middle-click (default behaviour on Windows browsers) can be achieved by searching for general.autoScroll and setting it to true.

Backspace does not work as the 'Back' button

As per this article, the feature has been removed in order to fix a bug. Follow the next steps to retain the original behaviour.

Open the browser and type the following address:


Search for browser.backspace_action and set it to 0 (zero).

Firefox does not remember login information

It may be cause of a corrupted Template:Codeline file in Firefox's profile folder. In order to fix this, just rename or remove the cookie.sqlite while Firefox is not running.

Open a terminal of choice and type the following:

$ cd ~/.mozilla/firefox/xxxxxxxx.default/
$ rm -f cookies.sqlite
Note: xxxxxxxx represents a random string of 8 characters.

Restart Firefox and see if it solved the problem.

Broken websites / input fields with dark Gtk Themes

When using a dark GTK theme, one might encounter Internet pages with unreadable input and text fields (p.e. Amazon - white text on white background). This can happen because the site only sets either background or text color, and Firefox takes the other one from the theme.

A work around is to explicitly setting standard colours for all web pages in Template:Filename.

The following sets input fields to standard black text / white background; both can be overridden by the displayed site, so that colors are seen as intended:

input {
    -moz-appearance: none !important;
    background-color: white;
    color: black;

textarea {
    -moz-appearance: none !important;
    background-color: white;
    color: black;

This will force the colours ("Allow paged to choose their own colors [..]" setting, in the Preferences > Content > Color dialog):

input {
    -moz-appearance: none !important;
    background-color: pink !important;
    color: green !important;

textarea {
    -moz-appearance: none !important;
    background-color: pink !important;
    color: green !important;

Change color values to suit, or use an add-on like Stylish.

File association problems

For non-GNOME users, Firefox may not associate file types (in the "Open With" part of the download dialog). Installing Template:Package Official amends the problem:

pacman -S libgnome

If you are using KDE you can also do the following:

ln -s ~/.local/share/applications/mimeapps.list ~/.local/share/applications/mimeinfo.cache

From now on Firefox should use the applications which are explicitly set in KDE.

"I'm Feeling Lucky" Mode

"I'm Feeling Lucky" mode lets the user harness the power of Google's "I'm Feeling Lucky" search engine feature via the Firefox address bar.

To activate this mode, do the following (solution from this forum post):

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

"I'm Feeling Ducky" Mode (for DuckDuckGo)

"I'm Feeling Ducky" is similar to the Google's "I'm Feeling Lucky" but using the DuckDuckGo search engine.

To activate this mode, do the following (solution using the above one):

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

The last character is a space ' '. It's necesary because if you don't put it, it will become a !Bang.

"Do you want Firefox to save your tabs for the next time it starts?" dialog does not appear

From the Mozilla Support site:

  1. Type "about:config" in the address bar.
  2. Set browser.warnOnQuit to true.
  3. Set browser.showQuitWarning to true.


An account of the trademark issues from the Firefox package maintainer for Debian.
Official website for the GNU Mozilla forks.