Intermittent graphic distortion when browsing
When browsing through different websites the graphics completely crash out on me, and only get to normal when I switch to another tab and go back to the one that was distorted. I've attached a screen shot so people can see what I'm talking about. Also, I'm using mac high sierra (I can't update beyond that because my macbook air is old) and the most updated version of firefox. Does anyone know how to fix this?