Why does the plugin checker never work? I'm fed up of error message
The plugin checker has never worked for me. Why?
The plug-in check page is still in development. Currently it only recognizes some of the most commonly used plug-ins.
This link give me an error also: http://www.mozilla.com/en-US/plugincheck/
This link works: https://www-trunk.stage.mozilla.com/en-US/plugincheck/