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Firefox - Streaks, Smeared Lines, or Blurry web Pages While Scrolling
There is a known issue in Firefox version 49 that causes images and text to display as smeared or streaky lines or tears while scrolling when used with certain older graphics cards. We are working hard to fix this in version 49 with a background update, but in the meantime, follow these steps to resolve the problem:
This problem is already fixed in Firefox 50 and up, which is available as Beta version at the moment.