Where has this been all my life? (Answer is Taiwan.) Sites like Netflix and Windows Update which require Internet Explorer can be opened in a new tab in firefox using this plugin. You still need to have IE installed on your computer, but you don't have to actually open it. Adds an "open in IE tab" option to your right-click menu on links. You can edit that and other behavior in the settings, including a filter list of sites you want to always open using IE.