Examine source code of Pusher Receiver

{
  "name": "Pusher Receiver",
  "version": "1.7",
  "description": "Receive iOS notifications from a jailbreak tweak called Pusher.",
  "manifest_version": 2,
  "permissions": [
    "notifications",
    "storage",
    "tabs"
  ],
  "web_accessible_resources": [
    "img/icons/loading.gif"
  ],
  "content_security_policy": "script-src 'self' https://*.restdb.io https://www.google-analytics.com; object-src 'self'",
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "https://*.restdb.io/*"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "img/icon/icon16.png",
    "24": "img/icon/icon24.png",
    "32": "img/icon/icon32.png",
    "48": "img/icon/icon48.png",
    "128": "img/icon/icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "img/icon/icon16.png",
      "24": "img/icon/icon24.png",
      "32": "img/icon/icon32.png",
      "48": "img/icon/icon48.png",
      "128": "img/icon/icon128.png"
    },
    "default_title": "Pusher Receiver Settings",
    "default_popup": "popup.html"
  },
  "applications": {
    "gecko": {
      "id": "burkybang@firefox.com"
    }
  }
}