Microsoft provides a Plugin for Firefox to perform WGA validation. It works the same as other style or functional Mozilla plugins (CookieSafe or NoScript for example).
If you open this Microsoft URL in a Firefox browser you should get two "Save File" pop-ups,
www.microsoft.com/genuine/diag/Instructions.aspx?displaylang=en&s=ci,cn&cnt=1
one for Windows Genuine Advantage and one for Office Genuine Advantage.
One pop-up window may hide the second so you'll have to move the top one with your mouse.
WGAPluginInstall.exe
OGAPluginInstall.exe
You'll want to save them to disk, then open them with an unzipper (WinZip, 7Zip, WinRAR), so you can see what's inside, then you can extract two files.
For WGAPluginInstall:
npLegitCheckPlugin.dll
nsILegitCheckPlugin.xpt
The .dll file goes into C:\Program Files\Mozilla Firefox\plugins
The .xpt file goes into C:\Program Files\Mozilla Firefox\components
-- substitute your Firefox install path as appropriate,
-- running the .exe installer will do this for you if you don't want to go through the mechanical details yourself
I believe there are some bugs with the plugin working with Firefox 3, or the 3 beta. It is working OK with my FF 2.0.0.20, although I do have to reload validated MS download pages sometimes. Manage the plug-ins in Firefox under Tools>Add-ons.
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