This extension allows you to add a query parameter to static files (JS and CSS). This is especially useful to force browser reloading files and to update your website design.
Install with modgit:
$ cd /path/to/magento
$ modgit init
$ modgit clone queryfier https://github.com/jreinke/magento-suffix-static-files.git
or download package manually:
- Download latest version here
- Unzip in Magento root folder
- Clear cache
- Logout from admin then login again to access module configuration
Simply enable automatic generation or define a query parameter in "System > Configuration > Queryfier > Suffix JS/CSS Settings".
Full overview available here.