Examine source code of Mute YT Ads

{
  "manifest_version": 2,
  "name": "Mute YT Ads",
  "version": "1.0",
  "description": "Mutes YouTube ads automatically.",
  "permissions": [
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "inject.js"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icon/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c84b3814-fed2-4093-aafa-377afd89d51f}"
    }
  }
}