Every once in a while I visit websites where they don’t appear as intended on Firefox (read as they don’t render well). The most annoying part here is changes in their text box sizes. They will be totally out of their dimensions in comparing to the same webpage on IE. Scott Granneman links to a fantastic extension for Firefox where we can resize the text box sizes now. The extension can be found from http://www.extensionsmirror.nl/index.php?showtopic=2796.
On the side note, my Firefox is doing all the things that my old dear browser Opera was doing it for me. I am exploring more and more day by day. Just installed three more extensions today.