After 120 update this week cannot access some sites including my own local NAS either at all, or without going through sveeral warnings
Updated FF Tuesday evening and noticed first on Wednesday when unable to log in to my Tesco food website. Access not allowed from this server or some such. I tried to use the Tesco feedback form and then got alerts both from Avast (saying it was infected) followed by FF refusal to connect. I tried safe mode and removing and adding FF.exe to Avast without change. I reset FF without change. MS Edge allowed access to all these sites without a murmur.
Today i can get to Tesco main site but still not Feedback.
Also my local Synolgy NAS now has a warning that it is dangerous to access from FF. Nothing has been changed in its set up or security. I can and do override and access everything
Something in the Tuesday update has caused this clash. I did think at one point I also saw 120.0.1 being offered but that may have been my confusion.
Happy user of FF fro many years and do not want to change.
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You can test older versions with mozregression to see if it worked previously and find when it stopped working.
It all worked perfectly on both sites using 119 and was misbehaving immediately after update to 120 at 17:50 GMT 21 Nov 2023
There are thousands of changes between versions, mozregression allows you to narrow it down to the precise change responsible.