I don't understand the purpose of your points here. * localStorage also works from the popup (using the same storage as the background; that's how the tutorial

I don't understand the purpose of your points here. * localStorage also works from the popup (using the same storage as the background; that's how the tutorial was able to work). * We're trying to get data working in the popup here, so how localStorage works in the contentscripts is irrelevant for solving this problem.