The MDN page for optional_permissions is missing compatibility for
browserSettings permission. How do find out the compatibility (for Firefox) and in general, what to do in cases like this? Is there a common place to report it? I would modify the MDN page myself if knew the answer…
EDIT: ok I just found the bugzilla page “Make browserSettings an optional permission” which was fixed in 57 - I think this is the answer I was looking for (please correct me if I’m wrong or my approach can be improved).