To use these add-ons, you'll need to download Firefox.

Qqen
Tignit n uzegrir

Iceggiren i Toggle Pin Tab

Toggle Pin Tab sɣur Andrei Petcu

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Icegger-it Seirdy
sɣur Seirdy, 9 jierren lyn
I use this not only to pin tabs, but also to move them. Invoking the shortcut twice moves a tab to the front of the list.

Tiririt n ineflayen

yeffeɣ-d deg 9 jierren lyn
I also pin and unpin to make the current tab the first on the left.