Why don’t you want to go back to Firefox? If you hate Mozilla just use a fork like Waterfox

Nothing specifically against Mozilla. As far as big techs go, they all have their hands covered in mud in some way. If anyhing, Mozilla would be one of the less dirty of them. As most everything else these days, rallying behind a big tech (as if that made any sense at all) is a matter of picking your poison.

My peeve with Firefox is that I think that it's just an overall worse browser, in terms of design and architecture, than Chromium, and it shows as it being mostly behind it in performance. As a software developer myself, this is important to me for an application that is a central part of my everyday life. I do use it sometimes as an alternate browser, and I realize that Firefox got a lot of improvement in the last few years, and that it's performance nowadays is really close to Chromium, but it all feel like lipstick on a pig kind of thing. I also quite dislike Mozilla's choices in UI design - every time they change it, it seems to be for the worse, as opposed to Chromium that has kept pretty much the same since its inception, with just relatively subtle changes since then.

I know I'll eventually get used to it, I guess I just dislike being forced to change.