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Random interactive ads play audio and video on my pages while I'm using Firefox.

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At first I thought the ads were part of Facebook, but their customer service says the ads linked to a third-party add-on to my browser. Now I'm seeing the ads on other pages. How do I find out what is allowing the ads and how to remove them?

At first I thought the ads were part of Facebook, but their customer service says the ads linked to a third-party add-on to my browser. Now I'm seeing the ads on other pages. How do I find out what is allowing the ads and how to remove them?

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Do you have that problem when running in the Firefox SafeMode?
http://support.mozilla.com/en-US/kb/Safe+Mode
Don't select anything right now, just use "Continue in SafeMode."

If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...