I'm not just talking about posting to forums, although it does happen. I also mean situations where you fill out some kind of web form, let's say it's a purchase and you have to enter your address and credit card details. Then you click on a link on that page either accidentally or purposely and it leads you away from the page. Or you click on submit and there is a server error. Or some other thing. Anyway, the point is, you've navigated away from the page and the submit either didn't work or you didn't do it. And now, when you hit back, all the form fields are blank again and you have to type all that shit over again.

Despite what Bitt says, this happens ALL THE TIME and MANY DIFFERENT WEB SITES in both firefox and IE. I'm sure we've all had it happen.