Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

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Thank you!

matantisi said

nor are they available by using the customize menu.

Not even when you click 'Restore Defaults'  ?

Thanks, both of you. While I was waiting, I just reinstalled the addons, which fixed the problem. If it recurs when I restart, I'll try your suggestions.