It’s been my primary browser for years but for a while now I’ve found it so unstable that I’m having to move to Chrome.
I found Chrome to be so unstable and constantly hanging (after a year of running very smoothly) that I had to go back to Firefox; now the machine runs great. Weird.
I have been using FF for a good number of years. The CEO fiasco caused me to look at others including Chrome (ugh, Google) but I am using Iceweasel (Debian’s version) on my primary computer.
Have you tried Pale Moon (they took open source from Firefox and made it better)