Examine source code of Zola

{
  "manifest_version": 2,
  "name": "Zola",
  "description": "Zola's brower extension",
  "version": "4.1.3",
  "default_locale": "en",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_popup": "src/popup.html",
    "browser_style": false
  },
  "permissions": [
    "cookies",
    "storage",
    "tabs",
    "*://app.zola.fr/*"
  ],
  "content_security_policy": "script-src-elem 'self'; script-src 'self'; object-src 'self';",
  "browser_specific_settings": {
    "gecko": {
      "id": "{d544bc6f-061b-4c68-a021-f97034ab598b}"
    }
  }
}