From ArchWiki

There does not appear to be an extension tab in the Gnome Tweaks program anymore. If someone more familiar with this kind of thing could update this section of the article, that would be wonderful! (at least if this isn't user error on my part.) AverytheFurry (talk) 10:42, 3 October 2021 (UTC)

GNOME upstream changes

Gnome made an upstream change in Gnome41 that deprecated the DBus method used to capture the screen and Flameshot no longer works in the v0.10.1, you need to update to v0.10.2: 1-b- (talk) 01:32, 19 November 2021 (UTC)

Thanks. Latest package is 12.1.0-1 now. Closing. --Fengchao (talk) 14:18, 27 February 2023 (UTC)