IE Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox.

If you need some instructions.
Please visit the official website on https://ietab.mozdev.org

This is a great tool for web developers, since you can easily see how your webpage displayed in IE with just one click and then switch back to Firefox.

What's New:

1.3.0.20070404
+ Added: A hidden pref "ietab.handleBookmarkURL" to decide whether removes the IETAB's chrome:// string in bookmark dialog.
+ Fixed: Failed to load URL (starts with "chrome://ietab/content/reloaded.html?url=") from addressbar.
+ Fixed: The alert(''); script on page load causes Firefox crash.
+ Fixed: The HTML code in "reloaded.html" causes 5 warnings show on HTML Validator.
+ Fixed: Compatible with Fx3.0a3 and SeaMonkey.
+ Improved: Some descriptions in Options Dialog.
+ Add locale: id-ID (Indonesian)