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Currently there is nothing that you can do, the avast browser security (AOS) isn’t a signed add-on, so it is flagged as such, but it should still work. Mine does on my other system win7 and FF 40.0.3.

Avast are trying to have this add-on signed and hopefully so before FF 41.0 or 42.0 when firefox will be disabling and preventing unsigned add-ons from running or being installed.

That is going to cause merry hell with old and abandoned add-ons that many use including myself.