ATT MAILL/YAHOO reports compatability problems fith FIREFOX. When I check compatability, FIREFOX only checks WIN-8; I use WIN-10
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Your User Agent shows: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:92.0) Gecko/20100101 Firefox/92.0/mwfpTeJH-26
Note the junk at the end.
Do you have enabled "Resist Fingerprinting" if you check ‘’’Resist Fingerprinting’’’ on the ‘’’about:config’’’ page as this affects the user agent?
- privacy.resistFingerprinting = false
In some other threads, the extra bit tagged onto your browser identification is suspected to be added by Avast AntiTrack. Does that sound like something which might be running on your system?