If people use Firefox, Netscape, Mozilla or Oracle it's not hard to check their history and bookmarks. I'm not familiar enough with other browsers to talk about them.

And here's a thought for all you paranoids out there:

They don't have to get to your computer! When you push the "do-it" button, your message is forwarded to a server somewhere. That server sends it to another server, and so forth, until it reaches its destination. They can put a tap on any of the servers and read what you've sent! Yes! Believe it, 'cause this time I ain't lyin' to ya.

There is no privacy -- learn to live with it.