Tried multiple times to get this to cooperate with bookmarks, which is all I need an extension like this for. No dice. Tried with multiple sites that have never been bookmarked, real ones, fake ones, etc.

This isn't really on the dev, it's Mozilla's adamant refusal to allow users to modify icons that's at fault.

Nice add-on, easy to use. Unfortunately does not work properly on all url patterns. Some URL patterns will be truncated. This issue does not base on very long url patterns but possibly on special characters like & / = which will truncate subsequent letters.

testing: from 10 bookmarks which I tried it only changed 1 favicon in main bookmarks panel but on the TABs it is displayed properly with changed favicons. It is nice simple and easy to use favicon add-on.

Unfortunately I`ve never found 100% working favicon changer/manager yet so to be honest I would prefer to have it as built-in feature of the firefox even though I know it is not the main focus of this browser. Anyway keep up the good work, I hope after some tuning it will work better for everyone, cheers

edit: I`ve seen dev response in the comments that "The current webextension api doesn't allow changing favicons for bookmarks" but imho the best use of favicons is to create bookmark panel with icons only (favicon on the TAB is not so important for me for example).

I like this extension but I am unable to change a favicon once I've set it for the first time. The only way to reset the favicon in order to change it again would be to delete the favicons.sqlite file from C:\Users\*username*\AppData\Roaming\Mozilla\Firefox\Profiles\*file.default*

I found the workaround but it is annoying the extension itself can't overwrite a favicon it has set.

Doesn't accept any of my .ico files. They all worked with previous versions of Firefox. The error "not an image file" is not specific enough to know what it means.

-update- (Feb 17)

The extension now supports my .ico files. Thank you Saber.

Unfortunately the extension doesn't effect the Bookmarks Toolbar's default icons for html files I have on my harddrive which is what I was hoping for.