Don’t forget you can just remove Snaps entirely. We left them in Lubuntu since Mozilla had Canonical move Firefox to being a Snap, and Firefox is the browser in the Ubuntu world. But we have thought about replacing it with Falkon, and we might revisit that at some point. Anyway, removing Snaps entirely is super easy on Lubuntu, and someone here even wrote a guide on how to do it, that I’ll dig up and add to this in just a bit.
edit: Found the guide. How to install firefox (non snap)