Examine source code of Metastream Remote

{
  "name": "Metastream Remote",
  "short_name": "Metastream",
  "version": "0.6.0",
  "description": "Watch streaming media with friends.",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://app.getmetastream.com/*",
        "http://local.getmetastream.com/*",
        "http://localhost:8080/*"
      ],
      "js": [
        "app.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "first.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "manifest_version": 2,
  "permissions": [
    "tabs",
    "webNavigation",
    "webRequest",
    "webRequestBlocking",
    "contextMenus",
    "<all_urls>"
  ],
  "optional_permissions": []
}