Examine source code of Block YouTube

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "version": "1.2",
  "description": "__MSG_extDescription__",
  "default_locale": "ru",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "*://*.youtube.com/*",
    "*://youtube.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    },
    "default_title": "Block YouTube"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "block-youtube-v2@example.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}