When I open Firefox my homepage comes up (good!) but often a second page/tab comes up with an annoying ad. My pop-up blocker is enabled and there are no exceptions listed. How can I stop this?

I recently had a virus attack and have cleared them with Malwarebytes Anti-malware. This problem didn't happen before the attack. In addition to happening when I open Firefox, occasionally an unwanted ad will pop-up in a new tab while using Firefox.

Firefox can store multiple home pages, check to make sure that the ad site is not listed as a home page. See [[how to set the home page]] for details.
You should run a scan with some other scanners to ensure that malwarebytes did not miss any. Some scanners you can try are:
* [http://www.superantispyware.com/ SUPERAntiSpyware]
* [http://www.lavasoft.com/products/ad_aware_free.php Lavasoft Ad-Aware]
* [http://www.safer-networking.org/en/index.html Spybot-S&D]
Also see [http://kb.mozillazine.org/Popups_not_blocked Popups not blocked - MozillaZine Knowledge Base], the above links come from that article, it also includes links to specialized forums for malware removal.

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