All browsers can tell you what certificate signed the one in use. Unfortunately a recent chrome UI change made this a pain to get to.in chrome, into the other browsers just clicking on the lock in the address bar, it soon becomes obvious if the company is mitm all SSL connections.
Because a normal person will "just click the lock in the address bar" on every single HTTPS website he visits to make sure his company isn't MITMing him, right?
