i hate to be that guy, but “works on my machine”. i use firefox on an m1 air all day every day and it runs flawlessly, although it starts chugging a little if i have 20+ tabs open (loaded). but i genuinely cannot remember the last time i’ve seen it crash.

like someone else said, try disabling your extensions, or reinstall firefox on a new user account to try to isolate the issue

You can try Librewolf or Waterfox. Librewolf is better on privacy ( like fingerprinting ), Waterfox quicker. And both have no Ai on board. You should use them with UBlock and I would not install to many extensions.

I run firefox on an m2 with a hundred tabs regularly and rarely do i have an issue. When i do i can usually narrow it down to one tab. I’ve got unlocked origin, youtube nonstop, and maybe a few other utility extensions. Maybe try disabling your extensions and see if that helps?