Yesterday I tried to download Serbian UI language pack to do some testing on a partially localized Windows. The download is free, but requires a Genuine Windows Advantage validity check – essentially, Microsoft wants to make sure your Windows copy is legal.

My copy is legal, so I just clicked the button, completely forgetting that I am using Firefox. Well, it turns out you don’t need Internet Explorer and ActiveX any more – there is a special plug-in (installer has about 500KB) that will enable the validity check straight from the Firefox.

This just goes to show that when Microsoft has an interest to wants to support Firefox, they can