Falls noch aktuell und nicht gelöst, folgender Zitat aus der angegeben Seite
The basic principle is as follows: If you want to customize a website you switch to an edit mode (either by pressing F10 or by clicking on the statusbar icon) and create a "script" consisting of a series of actions and a defintion for which sites the script should be applied. The script with its actions is then executed after every load of the website.
Fettmarkierten Bereich beachten, weiß nicht was du falsch gemacht hast.