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My problem is SOMETIMES I normally close FF but when starting it again, ALL my App Tabs are gone. I have no sense what is the cause of this since FF and others applications work normally those times... So I'll send you information about my configuration of FF, please see attached images.

The problem I have is that I cannot access the add on bar.

I have installed the Autofill Form several times, and it never shows up in my toolbar.

blyfox, you should start a new thread instead o posting a unrelated question in a old thread that was originally made about a year ago.

Do make sure your "Add-on Bar" is visible.