Two days ago I talked about how to Update Windows using Mozilla Firefox. You’d have to install a third party unofficial plugin from another website which I do not recommend.
Today I found another better and more stable way of doing it.
You can open WindowsUpdate from Mozilla Firefox using IE Tab.
IE Tab, an extension from Taiwan, features Embedding Internet Explorer in tabs of Mozilla/Firefox.
This extension is derived from the famous extension IE View, but they are quite different.
While IE View always open IE-only pages in newly launched windows of Internet Explorer, IE Tab can open them in tabs of Mozilla/Firefox.

To enable Firefox to always remember to use IE Tab whenever you do Windows Update, go to Tools -> IE Tab Options.
Add http://windowsupdate.microsoft.com/ to “Add Site:” box and click on the Add button.

The next time you visit WindowsUpdate site, it will automatically use IE Tab.
Have fun updating your Windows!