Excellent! I've been wanting this toggle control in firefox for a long time now. A sorely missing control. My primary browser is firefox, but I sometimes switch to safari when I want to stop javascript on a particular webpage. This toggle button addon bascially does the same thing here that safari does in it's preferences -> security pane. Plus the addition that it automatically reloads the page for you. (It also has a preference setting to let you control auto-reloading in both directions.) It's even worth a small donation! (but it's not clear I can set the amount?)