The master password is erased upon shutdown
I reset the master password several times and it lasts until I shutdown and restart. When this occurred all of my saved passwords were erased. I have since set up one new saved password and it has not been erased.
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Try a new Profile.
http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows
If the new Profile solves that issue, see this:
http://support.mozilla.com/en-US/kb/Recovering+important+data+from+an+old+profile
Make sure that you do not use Clear Recent History to clear the passwords.
- Tools > Options > Privacy > Firefox will: "Use custom settings for history" > [X] Clear history when Firefox closes > Settings
- https://support.mozilla.org/kb/Clear+Recent+History
If you use cleanup software like CCleaner then check the settings for the Firefox application.