This keeps popping up on my computer? Firefox, new tab keeps opening to this page?

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Mozilla isnt a .com website. NEVER install 3rd party software onto firefox, since its a standalone application with its own add-ons. M suggest to you is 4 steps:

1) go to mozilla.org and download the most recent version of firefox, dont install till step 3
2) uninstall firefox on your computer, including preferences and cache
3) reinstall firefox using the .bin file you had downloaded in step 1
4) click on the firefox thingy in the top left corner of the firefox window, click add-ons and install adblock

If this doesnt work then you most certainly have a backdoor trojan and you should format your HD since theyre notoriously difficult to get rid of. In fact, using a program like malwarebytes will most likely open your system up to more specific attacks including identity theft and ghosting.