I also use Floorp! Firefox is my favourite mobile browser, with the address bar at the bottom for easy access, and also easy-access, reliable tab sync, with Floorp on the desktop for its workspaces feature + the ability to use the old Firefox style (with minimal tabs) with a simple toggle.

The only browser that could measure up to it (meaning it has the same feature set for both desktop and mobile) is Vivaldi (Correction: Last time I used it, Vivaldi was missing a crucial feature: the ability to only show bookmarks on a new tab) but that often feels too complicated and takes too long to set up. If Vivaldi had the ability to, say, sync up all your settings and customisations, as well as tabs, I'd probably be using it right now, or at least consider it. I mean, neither is fully open source, but I'm more likely to trust the Vivaldi team than Ablaze (the company behind Floorp).