Before ordering a computer from HP, the shopping cart page has a button to click on to estimate tax and shipping. Clicking on it opens a pop-up window with a form to enter zip code and state. This form is run by a company called liveperson, and when I fill it in from the Firefox browser, and submit, it shows up again as if I hadn't filled it in. I don't know what programming language liveperson uses for this form, so I don't know how to find out if Firefox has a plug-in for it. Does anyone know? It's annoying to have to restart the process in IE, which has no problem with this form.