I can provide examples but I guess my question is, is it worth reporting these? Or will it just never get fixed?
Edit: spellcheck
Spend a day turning this into a bug report that's up to the standards of Mozilla; maybe another day trying to track down the behavior and suggest a patch. File the bug, and maybe the patch, and then implement a work around and go on with your life. Sure, watch for replies and try to respond in a timely fashion, but don't expect anything.
That said, I've put in a bugzilla bug and it got fixed in a reasonable time and then pushed in the next eligible release; https://bugzilla.mozilla.org/show_bug.cgi?id=1740856 but it was widely applicable, and the observed behavior was clearly broken, but details were hard to observe for many (which is why effects from the bug were observed but not diagnosed in related bugs)
Someone educate me, especially if I am off base or the code is inherently incorrect.
You basically wrote the entire bug report here, instead of doing it on Bugzilla.