I have an application that supplies long list of parameters to a web page, so I have to use POST instead of GET. The problem is that when page gets displayed and user clicks the Back button, Firefox shows up a warning: To display this page, Firefox must send information that will repeat any action (such as a search or order confirmation) that was performed earlier. Since application is built in such way that going Back is a quite common operation, this is really annoying to end users. Basically, I would like to do it the way this page does: http://www.pikanya.net/testcache/ Enter something, submit, and click Back button. No warning, it just goes back. Googling I found out that this might be a bug in Firefox 3, but I'd like to somehow get this behavior even after they "fix" it. I guess it could be doable with some HTTP headers, but which exactly? Source: Tips4all