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Weird Green flashing cursor in top left of firefox screen

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I get a weird green mark on the top left, which looks like some type of greenscreen cursor input thing. I have seen it on Gmail. Not sure where else. Last time was a while ago.

This is on Windows 11. Just worried if this is some type of backdoor thing.

I get a weird green mark on the top left, which looks like some type of greenscreen cursor input thing. I have seen it on Gmail. Not sure where else. Last time was a while ago. This is on Windows 11. Just worried if this is some type of backdoor thing.
Attached screenshots

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Terrible screenshot.

Do you have the same issue with Firefox in Troubleshoot Mode?

I have no such issues. see screenshot

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