can firefox automatically save usernames and passwords
the savings of usernames and password is a cool feature.....
can it be saved automatically without asking the user for permission
No. That would be a serious security and privacy issue. Imagine you are on a (public) computer that is not your own and its owner has configured that computer that way. Then he can silently collect the passwords of all that use this computer.
The System Details list shows you run an older Firefox 43.0 version that is no longer supported with security updates.
Please update to the current Firefox 57.0.1 release.
- Help -> About Firefox