Warning: You take full responsibility for any actions taken using segregate-refs.js. You must read and understand all relevant Wikipedia policies and abide by them when using this tool; failure to do so may result in being blocked from editing.
Instructions on how to install and use the script are at /Short instructions.
This page in a nutshell: Temporarily moves footnotes to a separate text box on the edit screen, adding them back in when the page is saved.
References segregator (segregate-refs.js) is a user script by PleaseStand – an attempt to make editing articles that have many citation templates easier. It works by moving the first non-empty occurrence of a <ref> tag to a separate text box that is below the main editing textbox. That first occurrence of the ref is replaced by a short tag as if there were an identical reference before it. It is also capable of migrating articles to the list-defined references format (LDR).