I keep noticing tabs for optical express, voda phone and others opening at the bottom of the screen when I haven't been to their site. How can I block them?

When I am on the net, I keep noticing websites which have opened a tab at the bottom of the screen, vodaphone, optical express etc advertising their wares, How can I block them?
== This happened ==
Every time Firefox opened

Do a malware check with a few malware scan programs.
You need to use all programs because each detects different malware.
http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
http://www.superantispyware.com/ - SuperAntispyware
http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

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