Firefox Extension Check

Mozilla has created a page to detect and verify status of plugins:

(Quoting) The Mozilla Plugin Check page is a general tool for keeping web browser plugins up to date.
Fully supported browsers do the following:

  1. Gathers every plugin’s metadata and optionally its live data
  2. Check with the Plugin Directory by mime-type
  3. Try to match the plugin metadata with information we know about plugins.
  4. If there is a match, then check to see if the version is outdated or has a security vulnerable.

Although the supported top plugins are a healthy portion of the traffic on the internet, we have a long way to go in terms of covering all plugins.

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Additional information about the project: