Examine source code of Kindred Cashback

{
  "manifest_version": 2,
  "version": "3.4.2",
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "Kindred",
    "default_icon": {
      "16": "icons/grey/16.png",
      "24": "icons/grey/24.png",
      "32": "icons/grey/32.png"
    }
  },
  "content_security_policy": "script-src 'self' https://cdn.segment.com; object-src 'self'",
  "background": {
    "scripts": [
      "static/js/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "static/js/contentscript.js"
      ],
      "css": [
        "static/css/contentscript.css"
      ]
    },
    {
      "matches": [
        "*://localhost/*",
        "https://kindred.co/*",
        "https://*.kindred.co/*",
        "https://kindred-customer-website-flapjack.azurewebsites.net/*",
        "https://kindred-customer-website-blizzard.azurewebsites.net/*"
      ],
      "js": [
        "static/js/browsercompat.js"
      ]
    }
  ],
  "short_name": "Kindred",
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "default_locale": "en",
  "icons": {
    "16": "icons/color/16.png",
    "48": "icons/color/48.png",
    "128": "icons/color/128.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "webRequest",
    "http://*/*",
    "https://*/*"
  ],
  "externally_connectable": {
    "matches": [
      "*://localhost/*",
      "https://kindred.co/*",
      "https://*.kindred.co/*",
      "https://kindred-customer-website-flapjack.azurewebsites.net/*",
      "https://kindred-customer-website-blizzard.azurewebsites.net/*"
    ]
  },
  "web_accessible_resources": [
    "static/media/*.*",
    "static/css/*.*",
    "static/js/*.*"
  ],
  "minimum_chrome_version": "70",
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@kindred.co"
    }
  }
}