Install WGA and OGA Plugins for Firefox for In-Browser Validation
A lot of users doesn’t aware that Microsoft has actually provided plugins for Mozilla Firefox web browser that allows in-browser automatic genuine Windows or Office validation, similar to WGA Validation Tool for IE browser. When user attempts to download WGA genuine validation required application software from Microsoft Download Center, although when “Continue” for “Validation Required” button is pressed, user gets redirect to Windows Genuine Advantage plug-in installation to download and install PluginInstall.exe (WGAPluginInstall.exe or OGAPluginInstall.exe) plugin, however, in some cases, the “Download Plug-in” button will not trigger the download link to the plugin installer, instead will further redirect user to download and use alternate method using GenuineCheck.exe and the generated validation code to validate.
To ensure the your Mozilla Firefox can always perform in-browser validation without having to download and run any other executable as in alternative validation method, it’s recommended to install the WGA-plugin and/or OGA-plugin for Firefox before downloading anything from Microsoft Download Center. Of course, only if you’re having a truly valid and licensed genuine copy of Windows XP, Windows Vista and Microsoft Office products.
To initiate the downloading and installing of the plugins used for Windows Genuine Advantage and Office Genuine Advantage validation, go to http://www.microsoft.com/genuine/ (Genuine Microsoft Software site), and then click Validate Windows and/or Validate Office button, which will then load plug-in installation page that detects if plugin has been installed and prompt for download if haven’t.
Or, simply use the following direct download links to download the setup executable:
WGAPluginInstall.exe
OGAPluginInstall.exe
After installation, the OGA and WGA plugins can be verified by entering about:plugins in Firefox address bar.

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February 1st, 2009 21:56
a mi me instalo el OGAplugin y tampoco se va la estrellita del office, aunque pasa la validacion porq es original… Alguien me puede ayudar?
December 3rd, 2008 23:31
THIS DOESN’T WORK. I KEEP GETTING MESSAGE SAYING DOWNLOADS.MICROSOFT.COM IS NOT AVAILABLE
May 15th, 2008 23:11
[...] provides easy way to validate genuine status of Windows and Office products via Mozilla Firefox web browser with plugins support. The plugin, WGAPluginInstall.exe installs npLegitCheckPlugin.dll [...]
May 4th, 2008 22:30
[...] WGA genuine Windows restricted software from Microsoft Download Center, user is prompted to download and install WGAPluginInstall.exe which will perform validation test on legitimacy of Windows XP or Vista installed. [...]
May 4th, 2008 06:47
why bother dl legal stuff at all