Created attachment 587610 [details]
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_2) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.75 Safari/535.7
Steps to reproduce:
Downloaded and installed the "Youtube player" add-on from a malicious site, http://bbpeonf14.blogspot[.]com/.
The malicious add-ons is currently hosted at http://anyhub[.]net/file/7av-youtube_player.xpi
Once installed, this add-on injects a series of <script> tags and hidden <iframes> into the DOM. Those script tags and iframes continually reload a series of banner ads, to generate revenue for the add-on authors.
It provides no service to the user/victim, does not do what it claims (play Youtube videos), and brings browser performance to a crawl.
It shouldn't have done anything it actually did.
Blocked at https://addons.mozilla.org/en-US/firefox/blocked/i51
Please file these bugs in Blocklisting component in the future.