How safe is Firefox password manager?

Related questions

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5. Should you use a different password for every account?
6. Are Firefox saved passwords safe?
7. Is dashlane password manager safe?
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9. Is dashlane password manager free?

Tags

1. #security
2. #based
3. #option
4. #ability
5. #without
6. #currently
7. #offers
8. #managers
9. #master
10. #browser
11. #password
12. #firefox
13. #passwords
14. #other
15. #encrypt
16. #mainstream