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

Qqen
Tignit n uzegrir

Iceggiren i favicon-customizer

favicon-customizer sɣur muffinresearch

3,2 n yitran ɣef 5
5
32
4
19
3
9
2
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28
Icegger-it Aseqdac Firefox 14976155
sɣur Aseqdac Firefox 14976155, kuusi vuotta sitten
Worked great, just leave the string box empty.

You do need to close and reopen the tab after restarting FF though.