Joomla extensions. Info and link for download for Extension:The ScriptMerge plugin is a Joomla! System Plugin that merges all the CSS stylesheets and JavaScript files on your Joomla! page into one single file, which means that the browser only needs to download one single file for CSS and one single file for JavaScript instead of dozens of small files. This decreases the number of HTTP requests and therefor optimizes the bandwidth of your site.