I get the message, "system infected: Adware Activity 2" using Firefox, but not using Explorer. Any ideas?

The above message is from Symantic Endpoint Protection. I have run virus scans 2 x and I have removed Firefox, then re-downloaded and re-installed. THe message persists.

hello, you may have malicious addons present. please perform all these steps:
# [[Reset Firefox – easily fix most problems|reset firefox]] (this will keep your bookmarks and passwords)
# afterwards go to the firefox menu ≡ > addons > extensions and in case there are still extensions listed there, disable them.
# finally run a full scan of your system with different security tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] and [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner], as they are specialised in adware which common anti-virus software might not even detect as threats.
[[Troubleshoot Firefox issues caused by malware]]

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