What Does Private Browsing in Firefox will not keep and keep?
How to turn on and off Private Browsing? Firefox Private Browsing is easily enabled by going to Tools>Start or Stop Private Browsing. Don’t confuse this feature with Firefox Safe Mode which is another feature in Firefox.
When you use Private Browsing in Firefox, the cookies, download list entries, search bar entries, form auto-complete entries, visited pages, cache and passwords will not be kept by Firefox until the current Private Browsing user will end the session. However, not all activities is deleted or not kept. When you save a bookmark and download any files, these items is kept by Firefox even after you’ve ended Private Browsing session.
The cookies manager in Firefox allows you add which cookies to keep though even you’ve enabled Private Browsing so be sure to review the cookies that you want Firefox to block or allow, if any.
Tips: Use Toggle Private Browsing add-on that will add button in Firefox status bar or toolbar instead of pulling the Tools menu or using the shortcut keys Ctrl+Shift+P. For people who always want to start Private Browsing in Firefox, select “automatically start" under Privacy tab in the browser’s options. To disable Private Browsing in Firefox, rename or delete nsPrivateBrowsingService.js that is located in Components folder of Mozilla directory.
Issue of Private Browsing in Firefox: You cannot use two open Windows of Firefox with two modes: Private Browsing mode and normal (non-Private Browsing) mode. This means Private Browsing window and non-Private Browsing window of Firefox cannot co-exist. This is possible to do in IE8 but not in Firefox. However, Firefox remembers the opened tab or pages and will open the pages again when you stop the Private Browsing mode or close/re-open Firefox.