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Pick favicon directly from bookmark properties Rated 5 out of 5 stars
I've been using Favicon Picker 2 for a long time--keeps getting better.
In some of the comments here lately, though, a bunch of users apparently haven't noticed that in order to pick a desired icon all you have to do is open the properties for the bookmark in question and just browse to whatever image you want to use; you don't have to use the Add-ons manager -> extension options route. It couldn't be simpler or more direct.