I switched to Firefox for the idealogical reasons above and was pleasantly surprised to find that it was a net improvement.
The only site I have compatibility issues with on desktop is MS Teams and even then it's only for voice/video calls, everything else works fine.
Firefox Android is a slightly less happy place. The password manager doesn't work very well (am moving away from the built-in one) and I can't log in on Amazon (which is important because I can't buy Kindle books in the app because of the Play Store).
Interesting. Firefox android works great for me, but Firefox windows gets very slow on my machine. I don't use their password manager on either, though, so I can't attest to that.
> but Firefox windows gets very slow on my machine.
This is why I don't use FF (although I'm on Linux). It's unusably slow for me. My experience is not the most common one (indicating that there's something about my ecosystem that FF hates), but I haven't been able to make FF work in any of the releases starting a couple of years back, I think.
I don't browse on my phone at all, so I won't be using FF there purely for that reason.
This is just more anecdata, but I'm exclusively using Firefox on Android and have never had issues with The Guardian. In fact, at this very moment there is a Guardian article linked on the front page, and I've visited it without an issue.
I don't doubt your experience, but it's clearly not universal.
The only site I have compatibility issues with on desktop is MS Teams and even then it's only for voice/video calls, everything else works fine.
Firefox Android is a slightly less happy place. The password manager doesn't work very well (am moving away from the built-in one) and I can't log in on Amazon (which is important because I can't buy Kindle books in the app because of the Play Store).