I tried Librewolf, but the unstable RPM repository was very annoying, because zypper disallows system updates if even one repository fails to refresh. I also had some weird issues keeping it pinned to my desktop environment's dock. It also didn't want to save its window geometry (very annoying for me), and the only way to transfer from Firefox is to manually copy your profile data.
But mainly, I'm still dependant on Mozilla no matter where I go. They are the ones actually doing the hard work of developing the browser engine; all of these forks are just some patches upon that, so with Firefox I only have to deal with (and trust) Mozilla and my distro, and not some other project in addition to Mozilla.