I was surprised to see Firefox not clear my logins and passwords of Gmail and Facebook. I never gave it permission to even save it in the first place. I’ve tried clearing everything and even disabling always browse in private mode from options and none of it worked. The solution I found that fixed this is selecting “Always clear history when firefox closes” That option gave me checklists to check off clear passwords etc. I normally use Chrome but it was work computer that was saving logins. It is hard to believe a person has to go to this extreme just to clear history and passwords in Firefox 26.