the-edmeister's Fixes common to all versions of Firefox
disable the "Plugin Finder Service"
and the "additional plugins" warning
Firefox versions - 1.0.x and 1.5.x.x
For users who do not have all the 'normal' media plugins installed and don't want to see that incessant reminder that additional plugins may be required for a webpage.
plugin.scan.plid.all changed to false turns the 'finder scan' off
plugin.default_plugin_disabled changed to false gets rid of the 'additional plugins needed' alert
You can either edit the Firefox preferences thru about:config or thru a user.js file. Keep in mind that by editing in your user.js file the changes are more 'portable'; you can drag'n'drop user.js into future Profiles you may create more easily.
about:config step-by-step instructions
type about:config in the URL bar and hit Enter
Filter = plugin
Preference name = plugin.scan.plid.all
Right-Click the Value and toggle to false
and
Preference name = plugin.default_plugin_disabled
Right-Click the Value and toggle to false
user.js prefs
// get rid of Scan for Plugins;
user_pref("plugin.scan.plid.all", false);
// get rid of the plugins needed alert;
user_pref("plugin.default_plugin_disabled", false);