The Firefox window pops up on a regular interval when any other program is being used, even when a film is playing in full screen mode from Firefox.

Question

The Firefox window pops up on a regular interval (I think every 5 or 10 min) when any other program is being used, even when a film is playing in full screen mode from Firefox. It does not happen if Firefox is not running (i.e. it does not start by itself). The OS is Windows 7 SP1 and this begun after installing the Firefox update 5.0.1. Exactly all programs are updated with the latest version, the computer is clean according to Microsoft Security Essentials. Please solve this problem.

Answer 1

-> Tap '''ALT''' key or press '''F10''' to show the Menu Bar
-> go to Help Menu -> select '''Restart with Add-ons Disabled'''
Firefox will close then it will open up with just basic Firefox. Now do this:
-> Update ALL your Firefox Plug-ins https://www.mozilla.com/en-US/plugincheck/
-> go to View Menu -> Toolbars -> unselect All Unwanted/Incompatible Toolbars
-> go to Tools Menu -> Clear Recent History -> '''Time range to clear: select "EVERYTHING"''' -> click Details (small arrow) button -> place Checkmarks on '''Cookies, Cache''' -> click '''Clear Now'''
-> go to Tools Menu -> Options -> General -> in '''Startup''' section click '''Reset to Default''' button -> place Checkmark on '''Show the Downloads window when downloading a file''' -> select Radio Button option2 '''Always ask me where to save files'''
-> go to Tools Menu -> Options -> Content -> place Checkmarks on:
1) Block Pop-up windows 2) Load images automatically 3) Enable JavaScript
-> go to Tools Menu -> Options -> Privacy -> History section -> '''Firefox will: select "Remember History"'''
-> go to Tools Menu -> Options -> Security -> place Checkmarks on:
1) Warn me when sites try to install add-ons 2) Block reported attack sites 3) Block reported web forgeries 4) Remember Passwords for sites
-> go to Tools Menu -> Options -> Advanced -> Network -> Offline Storage (Cache): click '''Clear Now''' button
-> Click OK on Options window
-> click the Favicon on SearchBar -> click '''Manage Search Engines''' -> select all Unwanted Search Engines and click '''Remove''' -> click OK
-> go to Tools Menu -> Add-ons -> Extensions section -> REMOVE All Unwanted/Suspicious/Incompatible Extensions (Add-ons)
-> go to Tools Menu -> Add-ons -> Appearance section -> REMOVE All Unwanted/Suspicious/Incompatible Themes (Persona)
-> Restart Firefox
You can enable your Known & Trustworthy Add-ons and Themes later. Check and tell if its working.