I have found Mozilla's sync across devices handy, but now I'm in the process of moving over to using Vanadium on my GrapheneOS phone and FireDragon on desktop.
FireDragon started out as a Librewolf fork, but is more recently based on Floorp. They are still keeping in sync with Librewolf's privacy enhancements, with some of their own thrown in. I like that the default search engine is Garuda's instance of Searx, with Whoogle as another option if you don't want to self host. FireDragon will also sync your Firefox account off Garuda's server instance if you like (which would be more useful if I weren't going with a Chromium fork on mobile). The Garuda project is certainly looking more trustworthy than Mozilla these days.