🤯🤯🤯

This was a great extension as long as it worked. Doesn't work at all now, with Fx 72 and on, with Win10. If you have the same problem, try instead Favicon Switcher.

Doesn't work for bookmarks.

Works as expected but it would be better if it uses less excessive permissions.

Handy means of changing or adding a favicon, especially valuable for pinned tabs. (You may have to unpin the tab first, but you can pin it back.) A drawback is the lack of documentation or a descriptive title. Doesn't work for bookmarks.