system
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If you have Chrome installed on your system you can use following steps (until we provide a fix):
In Avast
Go to settings → passwords
Click on Install for Google Chrome
Chrome gets opened on page with installation button for chrome extension
Copy URL from Chrome address bar
Paste it to Firefox address bar
At the end of URL there is parameter determining browser so change p_pmb=2 to p_pmb=1
And hit enter
Now follow the installation for Firefox