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about:plugins displays a list of installed and detected plugins, including the file name and associated MIME types. To view this list:

  • Firefox: Type about:plugins in the Location Bar (address bar) and press the Enter key.
  • Mozila Suite / SeaMonkey: Open the Help menu and choose "About Plug-ins".

Note: Starting in Firefox 3 and SeaMonkey 2, disabling a plugin via "Tools -> Add-ons (or Add-on Manager) -> Plugins" will remove it from the about:plugins list; re-enabling a disabled plugin will add it back to the list.

To show the full path to the plugin instead of just the file name, type about:config in the address bar and press the Enter key. Find the preference plugin.expose_full_path and change the value to true (double-clicking the preference name will toggle the setting). Caution: Exposing the full plugin path can have security implications on some systems. [1] It's best to reset the preference to the default "false" value when you are done.

This screenshot shows the beginning portion of an about:plugins list in Firefox 4, on Windows 7.

In some cases, about:plugins may display outdated information, even after a restart. To refresh the list, close your Mozilla application and delete (or rename) the file "pluginreg.dat" (see the profile folder article for the location). The file will be generated. [2] [3]

See also

Related bug reports