I just sent an email from gmail loaded in my Chrome web browser. Also on the Windows 7 computer is AVG "anti-virus". Turns out AVG somehow managed to insert a signature into the email I sent out.
This seems like a huge breach of security, in either chrome, Gmail, or Windows 7, as I never added any AVG extensions to chrome.
How was AVG able to interact with Chrome (or Gmail) to inject the signature into my email.