From MozillaZine Knowledge Base

You can see what plugins are installed and enabled by visiting these pages (see also about:plugins):

• Plugin Check at mozilla.org (Includes version information and update links)
• Plugins Information - Browserspy.dk (Includes link for detailed plugin information with MIME Types listed)

You can test your plugins to see if they are working by visiting the pages listed below.

Embedded media

The embedded media on these pages require a plugin:

• Java test page at java.com (More Java test pages here)
• Test Adobe Shockwave Player at adobe.com
• Adobe Flash Player test page at adobe.com
  • Alternate Flash plugin test pages: Flash video with sound (YouTube Help Center) and Adobe Flash Player Test Page - ChemgaPedia
• Embedded PDF at plugindoc.mozdev.org
• QuickTime videos at apple.com: Movie trailers and Apple - Events
  • Alternate QuickTime plugin test page: Embedded QuickTime Movie Test Page at sillydog.org
• Windows Media Player test at hg.mozilla.org
  • Alternate WMP plugin test pages: Windows Media test at vdat.com and Windows Media Test at ce.uwex.edu
• Navigation Framework video at silverlight.net
  • Alternate Silverlight video links: Experience Smooth Streaming page at www.iis.net and Silverlight videos here and here at msdn.microsoft.com
• RealPlayer test pages (Warning: These links may cause a crash in the RealPlayer plugin [1] [2]) Test your Real media player at www.slp3d2.com Real Player Plugin Test Page at www.chemgapedia.de RealPlayer Test at www.udel.edu and Live Streaming Video at video.nationalgeographic.com

Other media tests

• Direct links to Real Media files: realtest.rm at courses.worldcampus.psu.edu slp3d.ram at www.slp3d.com
• Direct link to sample PDF file at adobe.com
• Download Example FLV Files at mediacollege.com
• Mime/File Types Test Suite at yolinux.com Note: Not all links here are working
• QuickTime tests at wellesley.edu
• Embedding audio with the Object tag at lineone.net (includes embedded audio for testing QuickTime and WMP plugins)
• Technology Demo and Info page at csumb.edu (includes embedded MP3 audio)
• Embedding Multimedia at yourhtmlsource.com (includes embedded MID audio)
• Simple MIME type handling test at entropymine.com (linked from bug 315536)
• WWW Viewer Test Page at llnl.gov (Test links for various file types, including audio and video files)
• Flip4Mac Test Page at thirdplanetvideo.com (Links to WMV files)
• Information about the Multimedia file types that Windows Media Player supports at microsoft.com (includes links to sample media files)
• Plugins Test Cases Page at www-archive.mozilla.org (The content here is outdated and many of the linked test pages no longer work)

Open media

The following pages use HTML5 to embed audio and video in supported browsers such as Firefox and SeaMonkey 2, without needing a plugin (otherwise, Flash is used). Direct links to "open media" files (OGG and WebM) are also included.

• Video for Everybody Test Page at camendesign.com
• Firefox videos at www.mozilla.com