Obviously experiences will vary, but I have now had three organizations express concern (though not to the point of telling me I must stop) that I use third-party Firefox derivatives. This started with Pale Moon and then continued with LibreWolf.

The concern is that they "aren't authorized apps". As I've read it, this is a proxy for "we aren't certain these apps can be trusted, but nobody ever got fired for pointing the finger at Mozilla or Google when something goes wrong, but would be fired if they pointed it at this one random guy in the Netherlands".