Is there a way to assign a custom icon to a folder in Firefox bookmarks?
That way not all folders would look the same, so I could delete the names and save some space in the bookmarks bar.
Idigas - if you're getting bored waiting, there's a fair amount of talk on Mozilla's forums about how to do it manually. See http://forums.mozillazine.org/viewtopic.php?t=565229 and http://forums.mozillazine.org/viewtopic.php?t=566896
It would seem the userchrome.js extension should allow you to edit these folder appearances.
I'm very late in this thread, but I was looking for the same thing. Turns out it seems samfind does the job.
I say it seems because I did not try it yet, but the features are pretty clearly expressed and meet the requirements stated by the OP.