Since Firefox 23 the addon doesn't fix this for me either.
The addon say the bug is fixed in Firefox 23, but at least in linux
isn't.
In the comments you have a solution:
https://addons.mozilla.org/es/firefox/addon/bug582139/reviews/495974/
For those guys who want to put their bookmark icon
You have to use the terminal or a file explorer.
http://kb.mozillazine.org/index.php?title=UserChrome.css
In my case is in ~/.mozilla/firefox/randomalphanumeric.default/
You have to create the direcory chrome and inside the file
userChrome.css with this text:
#bookmarks-menu-button{
2 matches
Mail list logo
