As you can see on the official web page, Windows Media Player plugin is compatible only with Firefox browser. Click the Get it now button from the left and you will be redirected to an official link to download the utility. After that, press Download Now, save the file to your computer and install the application. After the installation process is complete, open Firefox, click the Menu button and go to Add-ons. Select the Plugins panel and press Always Activate next to Microsoft® Windows Media Player Firefox Plugin. For further information, you can visit Mozilla Support web page.