They were bought up by some Chinese firm though and thus a lot of people lost trust in them. Not sure if anybody has done extensive research into what type of telemetry they gather. I would recommend FireFox but I never gave up hope for FireFox so you could consider me a fanboy. However FireFox Quantum has changed a lot of people over to it.

Firefox still has some UX deficiencies on macOS, I do use it on Windows though.

What really turned me off is how long it took them to implement video autoplay blocking. I sent them about four dozen requests, reports and outright pleas, and they didn't even add it to the roadmap until after I had given up hope. They were about two to three years late on that one.

Chromium's dev tools are still ahead by a mile as well, the Performance inspector has saved me days worth of debugging time.

I wondering if you aware the profiler tool that FF has https://profiler.firefox.com/

I somehow managed to miss that, thanks. It looks exactly like what I needed.

A lot of the Opera die-hards I know of moved on to Vivaldi which is trying to be the Opera folks remember. (It is also Chromium based, though.)