Use the Firefox ESR version. It only tells you to update once in a while (like six months), not every week. It’s the version for “groups who deploy and maintain the desktop environment in large organizations such as schools, governments and businesses...” It’s the version I use, someone on FR pointed it out and I’ll be grateful forever.
In any event, I think you need to reinstall Firefox because it shouldn’t be updating without your consent.
That’s my issue, I need to stay on an ESR version. I can’t be updating my OS for what I use the machine for.
I had to see which versions were ESR, cuz that’s all that I can count on CentOS actually having any commitment to making sure both CentOS and FF work.
When I do a major upgrade of CentOS, or when it supports a newer FF ESR version, then I’ll be looking to go to the next FF ESR version.
There are no guarantees with updates; they can have new configuration options with default settings that may not work, may be a security hole, etc. I don’t have time to be constantly researching and fixing updates that happen behind my back.
I think that’s the whole point of the ESR versions, so they may be a little more easily “tamed”.
Once all your updates (ALL) are turned off, and you research and plug all the security holes for that version, of course life is good for a while.
Of course it may take 6 months or so for security holes to surface, so I like let a new version “age” at least that long before trying to upgrade to it, for any software.