Shows a list of installed plugins located in the $adiircdir\Plugins folder.
See also /plugins.
Pressing F5, will refresh the plugin folder.
Click the "Install new" button, select the plugin dll, press "OK".
To load a unloaded plugin, select it in the plugins list, then press the "Load" button.
To unload a loaded plugin, select it in the plugins list, then press the "Unload" button. (A restart of AdiIRC is required)
You can find plugins in the forum.