Honestly, as a Firefox user, I agree. The Firefox evangelism gets too much for me that I’m genuinely concerned it’s going cult-like. There’s over-enthusiasm (in which I’ve fell victim to) and then there’s hounding people for bothering to choose a Chromium-based browser.
I use Firefox because it works best for most of my web-browsing workflows, but it has its issues - split screen tabs is one, it helps with my workflow for submitting database entries to MusicBrainz or RateYourMusic. Vivaldi has it, Firefox doesn’t, so I’ll use Vivaldi when I need to, even if I think Firefox has a bit more polish than Vivaldi. That being said, Vivaldi is more willing to add features that power users coming from Firefox or old, Presto-era Opera want.
I do feel like the evangelism is actually toned down in the Firefox-specific Lemmy community, oddly enough (at least on lemmy.ml). In fact, the top post as of this comment is complaining about the privacy issues with Firefox’s upcoming Fakespot integration, and the comments are in agreement.