Type '''about:config''' in a new tab which opens a configuration change page now click '''Enter''' . here in '''search bar''' type '''homepage''' which gives you a filter Result . Now click on '''browser.startup.homepage''' and change its value to '''about:home''' by double click on value column. click '"Enter"'. this will reset your homepage ,now Re-open Firefox . You can try to [[Reset Firefox – easily fix most problems|Reset Firefox]] to get a default firefox. Note:-Resetting might be cause to lost of your some preference, open pages or some settings.

Do a malware check with several malware scanning programs on the Windows computer. Please scan with all programs because each program detects different malware. All these programs have free versions. Make sure that you update each program to get the latest version of their databases before doing a scan. *Malwarebytes' Anti-Malware:<br>http://www.malwarebytes.org/mbam.php *AdwCleaner:<br>http://www.bleepingcomputer.com/download/adwcleaner/<br>http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml *SuperAntispyware:<br>http://www.superantispyware.com/ *Microsoft Safety Scanner:<br>http://www.microsoft.com/security/scanner/en-us/default.aspx *Windows Defender:<br>http://windows.microsoft.com/en-us/windows/using-defender *Spybot Search & Destroy:<br>http://www.safer-networking.org/en/index.html *Kasperky Free Security Scan:<br>http://www.kaspersky.com/security-scan *HitmanPro 3 - SurfRight:<br>http://www.surfright.nl/en/hitmanpro/ You can also do a check for a rootkit infection with TDSSKiller. *Anti-rootkit utility TDSSKiller:<br>http://support.kaspersky.com/5350?el=88446 See also: *"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked