I have a simple Chrome extension that uses the content script feature to modify a website. More specifically, the background-image of said website.

For some reason I can't seem to be able to use local images, even though they are packed in the extension.

body {
    background: #000 url('image.jpg') !important;
    background-repeat: repeat !important;
}

That's it, the simplest CSS... but it won't work. The browser doesn't load the image.