In light of numerous browser exploited I've switched to an external third party password manager. On android, even givin proper permissions, the app fails to recognize many password inputs in apps, sites, etc. Probably the result of bad design on the site or app operators part. On desktop the pwd app just works.
In my case I have zx2c4's pass and a Firefox extension named PassFF, so the extension just gets the usernames, passwords and anything else via IPC.
It does have a clipboard mode with an expiry timer, but I very rarely need that for anything.
Firefox's built-in password manager similarly doesn't use the clipboard, Google's doesn't, I believe Apple's doesn't.