Firefox for Mac (latest version)

Yesterday I installed the latest download of Firefox for Mac.
It seems that I can't visit a Web site, because I always get the message that the certificate is issued by an unknown authority.
I spent most of the day, find a solution and am fed up now with Ff I found several help pages, which suggests to remove cert8.db Ff is closed, reset Ff as well as several other solutions. I tried everything but nothing worked. No Web page has a valid certificate according to Ff.
I know well with Ff I have used for years on Windows, Linux, and Android and never had problems of this kind.
I'm on Osx 10.10.3 (released yesterday, April 9, 2015, with the last Ff available for Mac.
(27.0.1)
After spending a whole day to useless troubleshooting only one question remains: Ff is for Mac is not compatible with the new Osx 10.10.3?
Thank you.
René Hasekamp.

said reneh

In Avast I have disabled the option to shield Web "Scan for secure connections. Firefox now works

You must contact the Avast support and ask about it. Other types of protection
programs have also caused problems. Most resolved in their support.

Tags: Firefox

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