
// open the add-ons configuration (from http://stackoverflow.com/questions/22593454/):
AddonManager.getAddonByID(self.options.id, function(aAddon) {
    unsafeWindow.gViewController.commands.cmd_showItemDetails.doCommand(aAddon, true);
});


// open the add-ons configuration (see https://developer.mozilla.org/en-US/Add-ons/Inline_Options):
Components.utils.import('resource://gre/modules/Services.jsm');
Services.wm.getMostRecentWindow('navigator:browser').BrowserOpenAddonsMgr('addons://detail/firefox-dict-switcher@danielnaber.de/preferences');

use better way to open settings programmatically, as officially documented