We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

i have a red line down the middle of screen when playing YT vids , 1 side is better quality image color ect. than the other . what is causing this and how do i

  • 1 reply
  • 1 has this problem
  • 4 views
  • Last reply by cor-el

more options

the thin red line runs down the middle of the screen , the left side is of normal quality for my YT vids , the right side is enhanced with better color and clarity of skin tone and image in general . is this an addon or an add for some program ect. .

the thin red line runs down the middle of the screen , the left side is of normal quality for my YT vids , the right side is enhanced with better color and clarity of skin tone and image in general . is this an addon or an add for some program ect. .

All Replies (1)

more options

Can you attach a screenshot?


Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window