I use LibreWolf and Brave, although Brave is quite similar for me as Ungoogled Chromium for you, I'd probably put it in the "There's better" category. I just need it for some sites which don't work well outside Chromium, as for Ungoogled Chromium, the lack of MV2 is kind of a dealbreaker for me, and even though the browser itself is more trustworthy than Brave, it doesn't have proper ad blocking anymore, so it's basically up to whether I prefer a browser with less tracking or websites with less tracking, I went with the latter, although it's quite a tough choice, so I still put Ungoogled Chromium in the "would use it" category I guess. There's also Helium browser, based on Ungoogled Chromium, but the devs seem to be the same who developed some shady Chrome extensions before, as Switched to Linux pointed out in his video, so I can't trust them that much, but the MV2 support makes it maybe a bit better, and since the browser itself didn't do anything shady so far afaik, I can't recommend against it, but I'd put it to the "wouldn't use it" category. Same for Waterfox. Chrome, Edge, Opera go to bottom, telemetry is telemetry, no matter which nation's big corps do it imo, I agree on Orion, it being discontinued can make it insecure to use, also agree on GNOME Web and Falkon, although I'd make a bit of correction here, because Falkon uses QtWebEngine, which is a fork of the Blink engine. Firefox can be decent with some heavy hardening, debloating, but I personally don't do that, because there can be some more features, settings added in new releases, so it would require constant manual work to keep it actually private, so it still goes to "wouldn't use it". Vivaldi I don't have much against, other than not being fully FOSS, plus doing too much, I'd put it in "wouldn't use it". Floorp isn't bad, but it seems to ping a ton of Ablaze domains on startup, which is kinda sketchy to me, not sure why is it necessary, I'd say it's a "there's better", Zen isn't really for my taste either, and their privacy policy used to mention some connection to Microsoft as I remember, but not anymore, maybe I'm mistaking it with another browser idk, but based on their current privacy policy and track record, they seem trustworty, it isn't as good though as LibreWolf, because it doesn't remove that much stuff, e.g. the Sync, so it also goes to "there's better" I guess.

@amartinios oh that's weird. Are you still getting that error? It works fine for me now