I have this problem as well. It is likely due to Google changing the site URL from https://www.google.com to https://accounts.google.com. If you look at your saved passwords and filter it with google.com, you can see that all your login information is there but under a different site address.

Having to manually update saved passwords will be a huge inconvenience to a large number of users.

Ya i think so that is the problem i just noticed the URL change today is there any way save passwords to that URL

You will have to re-enter each name and password to make Firefox remember them once again.
You can remove the no longer needed and not working saved passwords from google.com after you have confirmed that the new passwords from accounts.google.com all work.

• https://support.mozilla.com/kb/make-firefox-remember-usernames-and-passwords