It's definitely frustrating, and sometimes even advanced devs don't know (or forget) about some detail that might be helpful.

Sometimes "why someone hasn't tried that" is less about being clueless and more about not assuming how much people know about things.

I can imagine someone at Mozilla going "how do we debug this" and failing to reproduce the problem (I run FF on two different Macs/OSX versions and it runs ok on both)

Maybe FF can add some telemetry or have a special debug version for those with the issue, but I see how it can be frustrating