Rated 4 out of 5 stars

It's a brilliant plugin and it worked flawlessly so far.

One thing that I had to change in the code was restoring the tab when switching to another URL.
in auto_fav.js , this is my new loaded function:

loaded: function(tab) {
/*if(tab.hasAttribute('faviconized')) return;
if(!faviconize.autoFav.check(tab.linkedBrowser.currentURI.spec)) return;*/
var faviconized = tab.hasAttribute('faviconized');
var toFaviconize = faviconize.autoFav.check(tab.linkedBrowser.currentURI.spec);
if((faviconized && !toFaviconize) || (!faviconized && toFaviconize)) {
faviconize.toggle(tab);
}
}

This review is for a previous version of the add-on (0.9.8.2).