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If you don't have the needed plugin or if the web page is coded specifically for Internet Explorer, you can install an add-on as a workaround: To re-enable a disabled plugin, follow the same steps but click the Enable button.
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For example, you may need to disable the optional VLC Media Player "Mozilla" plugin in order to play embedded QuickTime or Windows Media content, since the VLC plugin is also set to handle those MIME types but may fail. If you have more than one plugin installed that can handle the same media type, this can cause a conflict that prevents some embedded media from playing. Note: In Windows 7/Vista, the QuickTime browser plugin is already configured to handle all supported MIME types (as shown in about:plugins) and cannot be reconfigured. The solution is to go to your QuickTime Preferences and change the QuickTime browser settings by selecting the MIME types you want QuickTime to handle, such as those for MIDI, WAVE, MPEG and MP3 audio formats. In Windows XP and below, the QuickTime plugin lists the Quicktime formats and a few others by default, but QuickTime can be configured to handle other media formats.rpm (Real Media Playlist) format, so instances of other embedded Real media files (.rm. The official RealPlayer 10.5 plugin only lists the.wvx), and WMP provides no way of changing that list. The Windows Media Player plugin lists only the Windows Media formats (.asf.
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You can see the MIME types and file extensions that are handled by your installed plugins in the about:plugins list.
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Unlike Internet Explorer, Mozilla browsers will only use a plugin to play the media content if the plugin lists that MIME type otherwise, you will get a "missing plugin alert". Each plugin contains a list of file extensions and MIME types, (also called Internet media types) which it will play.
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