1. Go to one of the js subpages of your user page. You can choose a page such as these:

• meta:User:<Name>/global.js, which will be loaded in all wikis, in all skins
• meta:User:<Name>/common.js, which will be loaded only on Meta-wiki, in all skins
• meta:User:<Name>/vector.js, which will be loaded only on Meta-wiki, in the vector skin

2. Copy the following to the page you have chosen:

// [[File:User:He7d3r/Tools/ConvertPrefixIndexToList.js]] (workaround for [[phab:T35355]])
mw.loader.load( '//meta.wikimedia.org/w/index.php?title=User:He7d3r/Tools/ConvertPrefixIndexToList.js&action=raw&ctype=text/javascript' );

3. Clear the cache of your browser.

This will import the minified copy of the script I maintain on Meta-wiki.