Security.

There can be more to it, such as diversity, portability, backups, remote access, and configurations… but it comes down to basic security.

Browser based password managers are not the primary focus of the tool, but instead are included as an after thought to make it more convenient. But that means security is not necessarily the primary focus, which can obviously be an issue for you.

There is also the password issue. In order to use a browser based password manager, you have to sign into an account through the browser. But then when is the next time you log back into that account on the browser?

I use Firefox, and sync between all of my devices, which is awesome. But I only log into it once, maybe twice and then I’m done. However, I log into my password manager at least once a day, sometimes multiple times a day. So if there are any issues or concerns with the browser or the device, my passwords and credit card info are not compromised.

Then there is the security issue that browsers deal with constantly. Chrome (and their whole ecosystem of chromium based browsers) release zero-day patches at least once a quarter, if not more often. Which means the browser is at risk along with all the passwords you are saving there. Firefox and Safari also drops zero-days, but almost every browser is based on Chromium, which is a whole separate thing.

A separate password manager provides significantly more security because that’s its only job. A Swiss Army knife is a great tool, but a standard pair of scissors is just going to do a better job cutting then the little pair that comes on the multitool.