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CSS Grid Overlay Appears in Firefox but Not in Other Browsers

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I'm experiencing an unusual issue in Firefox: a CSS grid overlay is visible on various websites, while everything displays normally in other browsers (Chrome, Edge, etc.). This grid is not part of the actual website design and does not appear when using other browsers.

I haven’t activated any developer tools or extensions intentionally that would cause this behavior. Could you please help me identify what might be causing this and how to disable it?

I'm experiencing an unusual issue in Firefox: a CSS grid overlay is visible on various websites, while everything displays normally in other browsers (Chrome, Edge, etc.). This grid is not part of the actual website design and does not appear when using other browsers. I haven’t activated any developer tools or extensions intentionally that would cause this behavior. Could you please help me identify what might be causing this and how to disable it?
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