2-3 years ago i would give it a clear no: simply because to maintain a browser and a project of the size of firefox not 5-10 devs are needed but 50-100. most alternative firefox based browsers were old, obsolete, broken by default and a security nightmare.
librewolf itself has this dangerous quote in their faq:
"And also: no donations means no expectations. This means that people working on LibreWolf are free to move on to other projects whenever they want."
while this is in the context of devs leaving, which is fine, i think this is dangerous in the context of security. I want the devs to fullfill my expections.
the reason why i think librewolf is still interesting is their track record.
they managed to catch up to every major patch of firefox in a reasonable time.
my hopes for the future are not mozilla, due to their thousand horrible decisions, but a smol project called https://www.ladybird.dev/ though it will need a lot of time, effort and monies. sadly they use discord :facepalm_cirno:
There really isn't much point in using Librewolf these days when projects like Arkenfox or Betterfox can provide a pretty robust user.js file which when used in conjunction with CanvasBlocker and Ublock Origin can more or less provide the same functionality.
An argument can be made for Mullvad Browser though as it provides much the same functionality as the Tor browser does albeit without access to the network. If your threat level mandates that you use entirely separate browsers for certain activities then that would be a suitable alternative to hardened Firefox.