Swipe to switch tabs has recently been added to the nightly releases:

https://www.androidpolice.com/2020/07/27/firefox-now-support...

I don't see what there is to hate. It's a very deliberate gesture

I don't know when the last time I refreshed a website on mobile was. It's entirely possible that it could be coded in such a way that I wouldn't notice or accidentally refresh when I'm simply trying to scroll to the top of a page, but I think it's more likely that I wouldn't intentionally use it ever, but I would trigger it accidentally on occasion

Unless you're scrolling a lagging Twitter view and can't tell if you're momentarily frozen or already at the top.