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I recently installed Foxit Reader plugin for Firefox, but I like to uninstall it now. When I open the addons window, there is only one option under this plugin: Disable. I just want to uninstall, not to disable. How can I do that?

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up vote 7 down vote accepted

You may have to do it manually. From the Mozilla KB:

Manually uninstalling a plugin

If you can't use an uninstaller program to remove a plugin, you can remove it manually:

  1. In the Location bar, type about:config and press Enter.
  2. Search for the preference: plugin.expose_full_path.
  3. Double-click on the plugin.expose_full_path preference in the list to change the value to true.
  4. Enter about:plugins into the Location bar to display the About Plugins page.
  5. Each entry in the About Plugins page will have "File name:" followed by a path. Use Windows Explorer to navigate to the folder shown for the plugin you want to remove.
  6. Rename the file to something other than its normal name - e.g. npswf32 becomes Xnpswf32.

The plugin will be removed.

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This information is outdated (Dec 2014). For any firefox >V.22: expose_full_path is gone. Instead: enter about:plugins (instead of about:config) and there you get the paths. Navigating to each path, renaming from npWhatsover.dll to DISABLED_npWhatsoever.dll is my recommendation (for me was even possible while FF open), restart firefox and the cruft is gone (verify in about:plugins or the more visual end-user about:addons). – Frank N Dec 13 '14 at 10:25

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