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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?

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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.

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.

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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:

Also see Popups not blocked - MozillaZine Knowledge Base, the above links come from that article, it also includes links to specialized forums for malware removal.