I had an Adblock plus popup come up with my Firefox web page. It had all the Mozilla Firefox logos. The popup told me I needed to "subscribe" to a stronger version of Adblock plus for it to work correctly. Subscribe should have been my first clue. Failing to check the source was my second mistake. I hit subscribe, and three trojan files and one spyware file started tearing down my internet access. It reset my FTP, HTPPS, and HTTP ports. So, beware of a popup telling you to subscribe (or some other similar illogical term) to Adblock plus, when it is already installed and running on your computer.