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.

you can now see all the scripts in the json block on the options page :) (you can open it by clicking the "JS" on the bottom right of the popup)

:) thanks for the review.
it doesn't work on autoplay videos because it's just a script tag injected into the page. an autoplaying video doesn't load a new page, youtube's javascript does a request and replaces the video element in the dom (and a lot of other elements ^_^).

i don't know how much JS you know, but you might be able to implement something as a callback to a mutation observer: https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver

:)