I switched back to Firefox like 6 years ago and it's the input browser I use regularly. I do unfortunately have Chrome installed on all my machines too since once every couple of months I'll find some usually government website that only works properly in Chrome.

Firefox for Android is excellent too, especially since you can have add-ons. Between my Adguard VM in my tailscale network and Firefox ublock, my phone is an ad free place. Other add-ons that make the mobile internet more tolerable:

Google Search Fixer - Google give Firefox users a crappy old search UI. this extension forces the new nicer UI.

Old Reddit redirect - just redirects all reddit links to old.reddit.com. this bypasses the age verification nonsense Reddit introduced given I refuse to have an account there these days.

Video background play fix - this one just means any video you are watching in the browser will keep playing if you minimise the browser - some sites try to be helpful and pause the video.

ClearURLS - removes all tracking junk from URLS - make sharing links less miserable

Dark reader - essentially just a way to make any website dark mode.