Examine source code of 9gagScroller

{
  "manifest_version": 2,
  "name": "9gagScroller",
  "version": "1.1resigned1",
  "description": "Adds a red border to all webpages matching mozilla.org.",
  "icons": {
    "48": "9gag.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.9gag.com/*"
      ],
      "js": [
        "scroller.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1259778d-569d-4a97-b23c-700089a00f30}"
    }
  }
}