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A thin yellow border line around the Firefox window! How to get rid of that?

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Hi, Since a few days I have a concern : The Firefox window is surrounded by a thin golden yellow line. In full screen mode or not, that's always visible. I searched the web but couldn't find any conclusive solution. If you know please tell me :) It really annoys me :) Thank you.

Hi, Since a few days I have a concern : The Firefox window is surrounded by a thin golden yellow line. In full screen mode or not, that's always visible. I searched the web but couldn't find any conclusive solution. If you know please tell me :) It really annoys me :) Thank you.

Chosen solution

Thank you, I eventually got rid of that thin golden yellow border, after : 1 Uninstalling Firefox. 2 removing the Firefox folder in APPDATA All is explained there : https://support.mozilla.org/en-US/kb/uninstall-firefox-from-your-computer

Since that it's Okay. I launched a deep antivirus scan. (My security suite as a name beginning by a K.) It found and put on quarantine one Troyen that was located in my Download folder. I installed "Malwarebytes free" and launched a research that deleted some suspect files. It was late at night yesterday. It's now 8:40 PM here, in Paris France area. Thanks again :)

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It is possible that what you see is coming from a Windows feature (setting), i.e. this part is transparent in Firefox.

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 userChrome.css is causing the problem.

  • switch to the DEFAULT 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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thanks a lot I'm gonna try that

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I didn't find out where from comes the issue. What do you mean when you talk about "userChrome.css" I never created that file. Does it pre exists and can be corrupted? ... ... ... Okay, so : I eventually managed to get rid of the yellow border. Hooray! I decided to completely uninstall Firefox, but a simple "Refresh" has been suggested, I went for that refresh. It solved the problem. I was fed up o that stuff :) This posts will may be help someone else one day :)

Modified by misterpascal

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The yellow thin border came back. I give up for tonight :(

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You going to have to provide a screenshot of that issue and what you were doing when it happened and site it's showing up from.

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cor-el said

It is possible that what you see is coming from a Windows feature (setting), i.e. this part is transparent in Firefox.

Check your Windows settings. This is Windows 11 -

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Chosen Solution

Thank you, I eventually got rid of that thin golden yellow border, after : 1 Uninstalling Firefox. 2 removing the Firefox folder in APPDATA All is explained there : https://support.mozilla.org/en-US/kb/uninstall-firefox-from-your-computer

Since that it's Okay. I launched a deep antivirus scan. (My security suite as a name beginning by a K.) It found and put on quarantine one Troyen that was located in my Download folder. I installed "Malwarebytes free" and launched a research that deleted some suspect files. It was late at night yesterday. It's now 8:40 PM here, in Paris France area. Thanks again :)

Modified by misterpascal

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