I’m using primarily LibreWolf at home too, but every now and again there are websites that won’t work with it. So I still keep Firefox around for that because I haven’t figured out how to add exceptions to specific sites for LW.
Might actually be a good privacy strategy though. The sites that break are probably the most invasive. So it could be better to run them on a different browser that’s what you normally use, perhaps with efforts to spoof fingerprinting. Other than not visiting the site, of course, but it’s a decision you gotta make.