What are the ads for??

One common cause of pop-ups or ads injected into sites is an unwanted extension. Try this:

Disable ALL nonessential or unrecognized extensions on the Add-ons page. Either:

• Ctrl+Shift+a
• orange Firefox button (or Tools menu) > Add-ons

In the left column, click Extensions. Then, if in doubt, click Disable. Or try Remove.

Usually a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.

Does that change the ads you see?

Note: if no Remove button is available, this usually indicates externally installed software. This may help in that case:

(1) Check the Windows Control Panel, Uninstall a program. Clicking the "Installed on" column heading helps uncover bundled programs that can sneak unwanted add-ons onto your computer.

(2) Supplement your regular security software with additional anti-malware scans. This article lists tools other Firefox users have found helpful: Troubleshoot Firefox issues caused by 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 these free programs to scan for malware, which work with your existing antivirus software:

• Microsoft Safety Scanner
• MalwareBytes' Anti-Malware
• TDSSKiller - AntiRootkit Utility
• Hitman Pro
• ESET Online Scanner

Microsoft Security Essentials is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.

Further information can be found in the Troubleshoot Firefox issues caused by malware article.

Did this fix your problems? Please report back to us!