I use librewolf, with default settings, as my main browser. If a page doesn't work (which is quite rare for me) I usually turn of uBO which does the trick. There are of course a few known culprits that don't work, like Netflix. I have brave installed for that kind of thing 🤷.
Also Tor is definitely not more usable then Librewolf...
Could you point out any specific sites that don't work for you?
The VLC thing can be solved relatively easily by installing
opi
with zypper, and then runningopi codecs
, which will add all the necessary repos and install everything. After that VLC (and h.264 etc) will work like a charm.