FWIW. I think keeping the password manager separate from the browser makes wonderful sense.
- There are many times you need a password when you are not in a browser. For instance, on my phone where I don't even have FF installed, my bank's app can still get its password filled in automatically with LastPass.
- Using a separate password manager means you can use multiple browsers with no loss of password access. On my laptop I regularly use both Chrome and Firefox, and I have access to my passwords in both. On my phone, I can use my passwords from Safari.
I may be biased. My wife and share a LastPass account for all of our passwords. We have so many accounts, I can't imagine managing it any other way. Having access to the passwords on all our devices is really great.