I think it's related to the first tweet in this picture

Thank you
You used Window.opener
I do not think you reported it because its exploitation was not complete
I hope you remember it
It was in the Chrome browser

The reason that brought me here is that I was searching for an old tweet of yours in which you talked about the SelfXSS vulnerability in Google Chrome, so I went to your account but did not find it, so I found this link and then registered on this site.
Now I need that tweet to do some research 😅