Uhh, short answer: it's for convenience, not security.
--Easily obtaining passwords from your browser is a feature, not a bug. support.mozilla.org even provides steps that are readily googled:
"For the passwords you need to copy logins.json and key3.db. For the bookmarks you can either use places.sqlite or restore a compressed .jsonlz4 JSON backup from the bookmarkbackups folder. "
Why not? (t. Noob)
It is incredibly easy for someone to take your passwords by using the built in manager.
SHIT WHAT?
Why do they let you save passwords if it's not secure?????? Is it pretty easy to get your passwords out of your browser?
Uhh, short answer: it's for convenience, not security.
--Easily obtaining passwords from your browser is a feature, not a bug. support.mozilla.org even provides steps that are readily googled: "For the passwords you need to copy logins.json and key3.db. For the bookmarks you can either use places.sqlite or restore a compressed .jsonlz4 JSON backup from the bookmarkbackups folder. "