Force password generation

I keep running into situations where I need to generate a password but for whatever reason Firefox does not suggest one. Sometimes its an app not in the browser sometimes its a website that I guess didn't properly mark the box as a password field. Regardless of the reason is there any way to force Firefox on android or even desktop to generate a password? Even if Mozilla hosted a page with a password field that would do the trick. Unfortunately I'm usually logged with my Mozilla account already and creating a new account forces entering an email before showing a password field. Thanks