Super useful and simple. Would be nice to have a central place to manage all the scripts that are added. Some of mine set window.location, making them hard to re-edit without temporarily disabling the addon.
i have added a really basic thing for this where you can get all the scripts as a json block from the options page (accessible by clicking the "JS" in the bottom right of the popup) and if you paste it back in, you can save over your scripts.
