Browsers are like cars - everyone likes to choose what they like and then usually tweak it to make it a more personal experience.
The tweaking is usually where the issues occur - updates no longer supporting extensions, or settings are cleared with new installations and updates.
As a suggestion, try and keep your firefox installation as vanilla as possible, install the necessary browser extensions for security ad blocking, no-script etc and on top of all that - get away from the mainstream firefox and choose to install Firefox ESR instead.
ESR - Extended Service Release - it is to ensure stability and compatibility in large institutions where browsers need to be kept on a strict update schedule.
What does it mean? typically not all the bells and whistles supported immediately - and some outright simply not supported.
Overall, the ESR releases of firefox are far more stable and less prone to all the continual update cycle BS that is thrust upon the public when someone decide the world needs to have a new feature when the actual consumption of said feature would result in uptake of 0.0000000000001% of the population.
Like I said at the outset - everyone likes their browser "their" way. The less you customize and the more you leave as-is, the less issues you will generally encounter.
Get your security up to scratch, be vigilant about ad blocking and script blocking and stay on top of all the sites blindly adopting 3rd party scripts and trackers.
Roads?.. Where we're going, we don't need roads...
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