IE Tab

IE Tab is an extension for the Mozilla Firefox, Google Chrome and SeaMonkey web browsers which allows users to view pages using the Internet Explorer (IE) layout engine. This can be used for viewing pages that only render properly, or work at all, in IE (e.g., Windows Update), and to check the appearance of newly developed pages in both Firefox and IE from within Firefox. Pages viewed through the IE Tab extension are recorded in Internet Explorer's history, web cache, and so on, as if they had been opened in IE. The extension has become popular among web developers, since they can display and compare the appearance and performance of their websites in two tabs in the same browser.

Laura Blackwell of PC World wrote that the extension is useful for die-hard Firefox fans who still keep an Internet Explorer window open "just for those holdout sites that require IE to function." The extension "makes it a little easier to reduce your IE dependency: It lets you open a Firefox browser tab that runs sites intended for IE."