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Log-in difficulties in Firefox for Mac 129.0.2

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Ever since I upgraded to Firefox for Mac 129.0.2, I've been getting errors trying to log in pretty much everywhere. Not Mozilla, but Chase, Reddit, etc. On the first try, I always get an error about not being able to establish a secure connection, along with the offensive suggestion that I try a different browser or the site's app. It generally works on the second attempt, but it's not working for Reddit today, although I get the same "different browser" message. Also my sister has been locked out of Chase using Firefox for iOS 129.1 (and I think also .2), so I am worried about where this is going.

My system is old: a late 2012 MacBook Pro, running Catalina (macOS 10.15.7), the highest system it can run. Please don't suggest I upgrade my hardware unless you are personally willing to pay for it; I can't.

Ever since I upgraded to Firefox for Mac 129.0.2, I've been getting errors trying to log in pretty much everywhere. Not Mozilla, but Chase, Reddit, etc. On the first try, I always get an error about not being able to establish a secure connection, along with the offensive suggestion that I try a different browser or the site's app. It generally works on the second attempt, but it's not working for Reddit today, although I get the same "different browser" message. Also my sister has been locked out of Chase using Firefox for iOS 129.1 (and I think also .2), so I am worried about where this is going. My system is old: a late 2012 MacBook Pro, running Catalina (macOS 10.15.7), the highest system it can run. Please don't suggest I upgrade my hardware unless you are personally willing to pay for it; I can't.