Bitwarden is an open source, very popular choice, tried and tested. The Firefox extension works great, as do the mobile apps. The free version includes most of the features if you want to try it out.
If you’re considering paying for the most polished experience, 1Password is the nicest in my opinion. Stay away from LastPass. No opinion on Proton Pass, it’s still new. But I still choose Bitwarden because I like that it’s open source, and I COULD choose to self-host a server if I got paranoid (I probably won’t).