There's nothing to patch, scanning is not possible.
It's either the extension's choice to become detectable ("externally_connectable" is off by default) or it makes unique changes to websites that allow for its detection.
If it were just a matter of detecting changes to the DOM then this could only detect extensions that alter the LinkedIn website itself. I agree that would be much harder to make undetectable, but this seems like it goes beyond that.
If it were just a matter of detecting changes to the DOM then this could only detect extensions that alter the LinkedIn website itself. I agree that would be much harder to make undetectable, but this seems like it goes beyond that.