Ask Lemmy

I never fully did, but I did end up using Chromium more than I wanted to:

1. Some poorly written sites refuse to work with FF. My water company, for example. They eventually fixed it after I complained multiple times. Now they display a warning that it's "Optimized for Chrome" but no longer flat out prevent FF from logging in (you know, to pay bills and such).
2. FF Desktop still doesn't support PWAs, and their recent update says they're working on it, but they're half-assing it (installed web apps will still have the menu bars, address, bar etc). I self-host a lot of web applications and want them to appear like native apps. Hence, Chromium.
3. There was some recent ToS / Privacy Policy change, and everyone was knee-jerking "time to abandon Firefox" as if there's anywhere better to go. (This is probably what you're thinking of)
4. A good while back, Chrom(ium) was just flat-out faster. That's been a while, and I think when FF's "Quantum" update (or whatever it was called) came out in like 2016 or 2017, it put it back on par.