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

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Iceggiren i GNOME Shell integration

GNOME Shell integration sɣur Yuri Konotopov

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Icegger-it Aseqdac Firefox 12912696
sɣur Aseqdac Firefox 12912696, 8 jierren lyn
not sure how to reply, but that link you sent is for google chrome, not for firefox :(

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yeffeɣ-d deg 8 jierren lyn
Hello.

You do not have native connector installed.
Please read documentation [1]

[1] https://wiki.gnome.org/Projects/GnomeShellIntegrationForChrome/Installation

Edit:
This link for ALL supported browsers - Firefox, Chrome, Vivaldi and Opera