[dexen]

Unlike most desktop apps, browsers interface user directly with the internet, and it is dangerous out there.

For example, theres' case of stealing text from copy/paste buffer http://news.ycombinator.com/item?id=3314004

[dfxm12]

More and more desktop apps are interfacing the users with the Internet though, especially when you extrapolate Apple's model with their app store.

It is just as dangerous "in here" too...