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Over the last day, whenever a friend opens gmail in any installed browser (Chrome, Firefox, Edge) on her Win 10 machine, the developer console opens automatically.

Why might this be and how to stop it?

Googling, it doesn't look like it is possible to do this via Javascript. So a malicious proxy ought not be able to make it happen. Any ideas?

Maybe a malicious Windows program sending keystrokes to the browser?

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Having installed https://github.com/Code52/carnac to show keystrokes onscreen, I can now see that the F12 key is sporadically becoming sticky.

My working hypothesis is that this is a physical keyboard issue, not malware.

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