Avira PWM doesn't work anymore

I try to install the Avira Password Manager App in Firefox, but it doesn’t work. Because I am German, I see this error-page (see pic). Can anybody help me?

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Same problem.
I get the same error page but in English.
No announcement or notification from Avira or Mozilla.
I have lodged a support query with Avira.


Ich habe das gleiche Problem.
Bitte um Info -falls jemand eine Lösung kennt.

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I recently cleaned up my system and de-/re-installed Firefox
Now the Avira PWM can’t be installed anymore.
Its not even in the add-ons