I think the main issue is the people here suggesting and evangelising Firefox not really listening to those who aren't, which frustrates the other person. I think I fell into this with the fediverse, in the early days of Elon fucking up Twitter. There are perfectly valid reasons to not use Firefox right now. Maybe one browser or other works better for them, or has that one killer feature they can't live without. Firefox has that for some of us, too. Or Firefox has some weird quirk or bug that other browsers don't.
I personally use Firefox and Vivaldi. Vivaldi has tab tiling which is great for when I'm in the zone adding music to MusicBrainz or RYM, and it's not too clunky either. Tile Tabs WE doesn't cut it for me. For casual browsing, vertical tabs is nice and I use Firefox + Sidebery for that, which is better than Vivaldi's vertical tab implementation.