Why does an advertising page automatically pop up in a new tab right after I start Firefox?

In the last few days, whenever I've started Firefox my home page loads normally, but then a new tab automatically opens up with an ad, sometimes in the form of a system warning. Today's ad was from Snap telling me my Real Player was out of date. This is very annoying and alarming. Has Mozilla started distributing ads this way?

Do a malware check with some malware scan programs.<br />
You need to scan with all programs because each program detects different malware.<br />
Make sure that you update each program to get the latest version of the database before doing a scan.<br />
* http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
* http://www.superantispyware.com/ - SuperAntispyware
* http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
* http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
* http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and [[Searches are redirected to another site]]

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