For me Firefox has some showstoppers that Mozilla doesn’t seem too interested in fixing (tablet ui on Android, lack of share target support for pwas). I’m not some hater mind you, I want it to succeed.

And, crucially, security. It is far behind, on desktop and especially mobile. Process isolation aka sandboxing is superior on Chrome platforms. Unfortunately.

Didn’t they roll out per-tab Fission now? Looking at Firefox’s built in task manager I can see each tab in its own process.