Examine source code of CMS links

{
  "manifest_version": 2,
  "name": "CMS links",
  "description": "Provides links from your site to Contentful.",
  "version": "1.0.4",
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "george.gillams@typeform.com"
    }
  }
}