Most recently no matter what website I access my Firefox browser will popup a warning 'Additional plugins are required to display all the media on this page',
but I click 'Install Missing Plugins...' button and it will prompt
This really effects emotion.
How to remove this troublesome warning strip? You just key in
about:config in browser's address bar, and change certain item value to true. It's illustrated below.
The item is plugins.hide_infobar_for_missing_plugin.