Comment 3 for bug 497508

Yes, this bug would definitely seem to be a duplicate of #511840. To confirm this, I reinstalled ubufox, and once again the bookmarks toolbar icon disappeared, when I restart Firefox (just like I reported when I opened this bug). I do also have had Tab Mix Plus installed (have had it installed for over a year). If I disable Tab Mix Plus, the bookmarks icon stays visible, when I start a new instance of Firefox. It doesn't disappear from the toolbar icon.

So, yes, I'd say this bug is a duplicate of #511840: You can't have both ubufox installed and Tab Mix Plus installed and enabled--if you want to customize the Firefox Toolbar. My choice is to
# aptitude purge ubufox