How do I fix bug where toolbar items disappear every time I reopen Firefox?

All of a sudden, after using Firefox 4.0b6 for a few weeks, it would forget my toolbar settings, returning to its default set after closing and reopening the program.
All my custom buttons, as well as the Feedback button go missing. Also, the feedback button is not even available in the customization menu anymore.
I have tried the following fixes but the problem persists:
http://support.mozilla.com/en-US/kb/Back+and+forward+or+other+toolbar+items+are+missing

Regarding your home page, what do you get instead of Google? This can provide a clue about what is changing your setting.
Toolbars typically are generated by an extension, which is a type of add-on you can disable or remove (usually) here:
orange Firefox button (or Tools menu) > Add-ons > Extensions category
This article might be useful: [[Remove a toolbar that has taken over your Firefox search or home page]].

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