Dio Tools is called userscript like user scripts, you can manipulate the pages you are currently browsing, and change their appearance or their interface. It only takes a few steps to be able to use these scripts, see belo.
Install addon
Depending on which browser you are using, it should install the appropriate addon for your browser.

You probably have to restart your browser after the installation.
Install script
Download the script in one of these three possibilities being the main one and frequently updated on Greasyfork,
note that at every refrech of your pages in the Grepolis game you can check if your Dio Tools version is up to date if it is not will have a warning to download the new one version.
- Message received if version is not up to date:


In case that Grepolis was opened during the time of installion you have to refresh the page (press F5).