$app = JFactory::getApplication();

if ($app->input->get('component') == 'com_content') {
    // Bingo
}

$results = $dispatcher->trigger('onContentPrepareForm', array($form, $data, $group));

abstract public function onContentPrepareForm(JForm $form, $data, $context = null);

    /**
     * Listener for the `onExtensionBeforeSave` event.
     *
     * @param   string   $context  The context of the content passed to the plugin.
     * @param   JTable   $table    The record being saved.
     * @param   boolean  $isNew    If the content is just about to be created.
     *
     * @return  void
     */
    public function onExtensionBeforeSave($context, JTable $table, $isNew)
    {
        switch ($context)
        {
            case 'com_config.component':
                $this->processComponent($table, $isNew);

                break;

            case 'com_plugins.plugin':
                $this->processPlugin($table, $isNew);

                break;
        }
    }

    /**
     * Handles updates for a component's configuration.
     *
     * @param   JTable   $table  The record being saved.
     * @param   boolean  $isNew  If the content is just about to be created.
     *
     * @return  void
     */
    private function processComponent(JTable $table, $isNew)
    {
        // Only act when the com_content component config is saved
        if (!($table instanceof JTableExtension) || $table->name != 'com_content')
        {
            return;
        }

        // Do stuff
    }

    /**
     * Handles updates for a plugin's configuration.
     *
     * @param   JTable   $table  The record being saved.
     * @param   boolean  $isNew  If the content is just about to be created.
     *
     * @return  void
     */
    private function processPlugin(JTable $table, $isNew)
    {
        // Only act when this plugin is saved
        if (!($table instanceof JTableExtension) || $table->name != $this->pluginName)
        {
            return;
        }

        // Do stuff
    }