'''Scan for Malware''' Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of. You can try some of the following programs to scan for malware: * [http://www.malwarebytes.org/mbam.php MalwareBytes' Anti-Malware] * [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility] * [http://windows.microsoft.com/MSE Microsoft Security Essentials] (A good permanent anti-virus if you don't already have one) Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. '''Reset Firefox''' The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: ''This will cause you to lose any Extensions, Open websites, and some Preferences.'' To Reset Firefox do the following: #Go to Firefox > Help > Troubleshooting Information. #Click the "Reset Firefox" button. #Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish. #Firefox will open with all factory defaults applied. Further information can be found in the [[Reset Firefox – easily fix most problems]] article. '''Reinstall Firefox''' Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox and any leftover program files and then reinstall Firefox. Please follow these steps one by one: #Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer. #After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu) and confirm all upcoming messages. #Now, uninstall Firefox by following the steps mentioned in the [[Uninstall Firefox from your computer#w_uninstall-firefox|Uninstall Firefox]] article. '''IMPORTANT:''' On Windows, the uninstaller has the option to remove your personal data and settings. Make sure that you do '''not''' check this option; otherwise all of your bookmarks, passwords, extensions, user customizations and other Firefox [[Profiles|user profile data]] will be removed from your computer. After uninstalling Firefox on Windows, delete the "Mozilla Firefox" program folder, located by default in one of these locations: * '''(On 32-bit Windows)''' ''C:\Program Files\Mozilla Firefox'' * '''(On 64-bit Windows)''' ''C:\Program Files (x86)\Mozilla Firefox'' #Go to the Windows Start menu and click on "Computer". #In the Explorer window that opens, double click Local Disk (C:) to open the C:\ drive. #Find the "Program Files (x86)" folder or "Program Files" folder. #* On 32-bit Windows, double-click the '''Program Files''' folder to open it. #* On 64-bit Windows, you will see a "Program Files (x86)" folder AND a "Program Files" folder. Open the '''Program Files (x86)''' folder. #Look for a '''Mozilla Firefox''' folder. If you find one, right-click it and select ''Delete'' and confirm that you want to move the folder to the Recycle Bin. Now, go ahead and reinstall Firefox: #Double-click the downloaded installation file and go through the steps of the installation wizard. #Once the wizard is finished, choose to directly open Firefox after clicking the Finish button. Please report back to see if this helped you!