Examine source code of Skipper

{
  "manifest_version": 2,
  "name": "Skipper",
  "version": "1.0.0.4",
  "description": "Skipper is an open-source and creator friendly extension that automatically skips ads on YouTube when a 'skip ad' button is present.",
  "permissions": [
    "activeTab",
    "https://www.youtube.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "skipper16.png",
    "48": "skipper48.png",
    "128": "skipper128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{97016f48-2ce8-4e3e-8981-c2dff5b3861e}"
    }
  }
}