HOW TO SORT OUT MOZILLA BLACK WINDOW PROBLEM:

Start mozilla safe mode, and played around with some settings after I found that changing gfx.direct2d.disabled from false to true solves this issue. Hope you guys can use this solution as well.

Edit: To start Firefox in safe mode, keep shift pressed while you start the browser.

 Edit 2: To change FIrefox settings, type "about:config" in the address bar