I have a new computer and I tend to like Firefox so I downloaded it Then I encountered a weird problem that I've never had before. I open a window and access a website such as Apple. i click on the store, for example, and start scrolling down the page. As I scroll down the page whatever passes about the center of the page gets distorted along a line from the left side of the screen to the right side. (And sometimes a little higher than center.) Most noticeable with pages with images embedded in them though the same thing happens, I've noticed, to a lessor degree on pages with just text. Do the same with Safari , Chrome , or Opera and I don't notice the same problem. Can I assume the problem lies within the Firefox software rather than the computer?