Seems to work with Firefox 8 Rated 5 out of 5 stars

Seems to work okay with Firefox 8.0 (the latest stable version). There appear to be glitches (Firefox minimizes itself during startup! etc...). Roomy bookmarks (the alternative) appears to be okay though that also has random freeze ups and crashes:(

The other alternative Smartest bookmarks is okay:
https://addons.mozilla.org/fr/firefox/addon/smartest-bookmarks-bar/

For those who can't get this addon working with Firefox 8: Try out your luck and Install the addon compatibility reporter first. This will enable all addons (including the incompatible ones).

https://addons.mozilla.org/en-US/firefox/addon/add-on-compatibility-reporter/?src=ss