If you observed stop Private Browsing grayed out in Tools Menu in Firefox, but thinking that you never started Private Browsing session, yet it has been disabled, how this can become possible.
Firstly private browsing feature has been introduced from Firefox 3.5 which does not save any browsing history if user opts for private browsing, however bookmarks made and files downloaded will be kept.In Firefox 3.5 you can even configure options to start Firefox automatically in private browsing mode. User can enter into Private browsing mode by clicking Start Private Browsing from Tools menu or by selecting Tools>Options>Privacy>History: Firefox will “Never Remember History”. If you observed grayed stop private browsing under Tools menu means, you are running Firefox in Private Browsing session automatically each time it starts.Now click Tools>Options>Privacy> History Firefox will: Use custom settings for history and uncheck automatically start Firefox in a private browsing session.Click OK to save changes. Now you can able to observe start private browsing under Tools menu clearly. Related articles 
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Thanks for providing the perfect answer. I read through multiple eHow and other posts and everyone led me down the wrong path – saying I had corrupted backup files or something of that sort. Your answer helped me fix the problem in less than a minute.