Why does screen go black when I scroll a bit down
Whenever I go to a forum; I scroll down to look at posts however the screen suddenly fuzzes up and goes a bit black meaning I can't see what to click or anything, when I move my mouse over a bit of the blackness the buttons that are supposed to be there come back, I keep repeating this (Have no choice) but it's getting annoying. I try highlighting it but that makes it go fully black straight after.
== Not sure
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Start Firefox in Use Troubleshoot Mode in Firefox to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes). See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears. You can use "Disable all add-ons" on the Safe mode start window to disable all extensions. You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")