I dislike the fact that KeePassXC hasn't been mentioned here, so while I'm late, here I go anyway:
KeePassXC is an open-source password manager with extensions for Chrome, Firefox and Vivaldi, and is cross-platform with apps for Linux, macOS and Windows; but also iOS and Android (Keepass2Android, the one I use, uses the AutoFill feature of newer Android releases, which is a pretty neat addition).
On top of that it can also hold files and strings as secrets with the password entry, and also manage TOTPs. Which is handy to get your 2FA in check and also encrypt the recovery files with it too.
Simply save the database in Dropbox or Google Drive to be able to access it anywhere, anytime!
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