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Thin Lines on left (Firefox Mac)

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I have Mac Pro 2018 and having a problem with Thin Lines on left side of the browser (Firefox Mac) i can't find anyone on line with same problem explaining how they resolved the issue!

I have Mac Pro 2018 and having a problem with Thin Lines on left side of the browser (Firefox Mac) i can't find anyone on line with same problem explaining how they resolved the issue!
Mba’erechaha japyhypyre oñondivegua

Opaite Mbohovái (2)

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I'm not seeing thin lines in the screenshot you posted, so can you give more detail on where to look for them ?

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

  • switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window
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I just found out the lines on the screen! i am sorry! somehow the screenshot is not showing the lines!