Hi, I just installed FireFox on my Early 2011 MacBook Pro, and every time a page loads up, the screen flashes and flickers with long horizontal bars. It's not just the browser bar, it's the entire screen, and it's making FireFox unusable on my laptop. I tried changing the hardware acceleration, which reduced the amount of flashing but did not stop it from happening. I also tried running FireFox in safe-mode but I am still having the same issue. Any ideas on how I can fix this?