I would, if Mozilla focused on features users want :)
Yes, I know there are extensions for these things, but I, personally, find them horrible.
that addon is semi official
1) i never could get password/autofill syncing between several devices working quickly and reliable as in chrome.
2) no app mode in Firefox
3) on desktop i don't like the UI and i would need to install userchrome stuff to "fix" it.
I need a native switcher, or better profiles support. In chrom/ium browsers with velja (open to alternatives which support ff profiles), I can click a link and it prompts me in which profile I want to open. Only thing blocking me from switching to firefox. (and figma perf is bad on ff but that's not really a ff problem)