I always feel like these password solutions are there to lock you into their platform. I would never use Apples nor Mozillas password solutions personally.
That's a great reason to not use Apple's, but Mozilla's doesn't lock you in at all.
It's fantastic, and for some reason I trust OS/browser developers to do this more safely than a company focused on password management that has to figure out OS APIs, write browser extensions, or rely on a clipboard that has nearly unbounded read access.