Examine source code of Sponsor Blocker

{
  "manifest_version": 2,
  "name": "Sponsor Blocker",
  "version": "1.3",
  "description": "Skip sponsored ads in youtube videos.",
  "permissions": [
    "tabs",
    "storage",
    "http://www.youtube.com/*",
    "https://www.youtube.com/*"
  ],
  "browser_action": {
    "default_icon": "images/v2_32.png",
    "default_title": "Sponsor Blocker",
    "default_popup": "pages/popup.html"
  },
  "icons": {
    "48": "images/v2_48.png",
    "96": "images/v2_96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*",
        "http://www.youtube.com/*"
      ],
      "js": [
        "run.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "kristijan@c9.rs"
    }
  }
}