Examine source code of RateX

{
  "manifest_version": 2,
  "name": "RateX",
  "short_name": "RateX",
  "description": "Shop and pay with no fees and lowest exchange rate. Works on Amazon.com and many other more!",
  "version": "1.0.0.7resigned1",
  "homepage_url": "https://www.rate.com.sg/",
  "background": {
    "scripts": [
      "/assets/js-lib/jquery-3.0.0.min.js",
      "core/background.js",
      "core/message_handlers.js"
    ]
  },
  "web_accessible_resources": [
    "/*"
  ],
  "icons": {
    "16": "assets/icons/x_logo.png",
    "32": "assets/icons/x_logo.png",
    "128": "assets/icons/x_logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "/assets/js-lib/jquery-3.0.0.min.js"
      ],
      "css": [
        "/assets/stylesheets/fonts.css",
        "/assets/stylesheets/ratex-backdrop.css",
        "/assets/stylesheets/global.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.hotels.com/*"
      ],
      "js": [
        "/browser-action/js/redirects/r-f-hotels.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "storage",
    "http://*/*",
    "https://*/*",
    "tabs",
    "activeTab"
  ],
  "browser_action": {
    "default_icon": {
      "24": "assets/icons/x_logo_disabled.png",
      "32": "assets/icons/x_logo_disabled.png"
    },
    "default_title": "RateX"
  },
  "applications": {
    "gecko": {
      "id": "ratex@ratex.co",
      "strict_min_version": "42.0"
    }
  }
}