Userscripts.org

I didn't notice your query at http://userscripts.org/topics/15124 -- the purpose of the script is to add a "Load" button that loads the *current* contents of a script hosted remotely (not on us.o) into the source code field -- not automatically, only when clicked.

So, if anything, it is equivalent to clicking the remote script url, hitting ctrl+a to select it, ctrl+c to copy it, ctrl+n or ctrl+t to open a new window/tab, ctrl+l to go to its location field, ctrl+v to paste, enter to load it, wait for it to load, hit ctrl+a to select the full source code of the script, hit ctrl+c to copy, hit ctrl+w to close the window/tab, click the source code field, ctrl+a to select all of it, and ctrl+v to replace it with the new version.

That felt a bit too messy to do manually as often as I did at the time.