And then there happens a drive-by exploit that silently replaces your extensions with malicious versions. Now you think you are using the source you (be honest,

And then there happens a drive-by exploit that silently replaces your extensions with malicious versions. Now you think you are using the source you (be honest, you didn't) verified but you aren't. And it's being evil. The browser should totally have nice controls for what any extension can do.