Examine source code of Askew Improved

{
  "manifest_version": 2,
  "name": "Askew Improved",
  "version": "1.0",
  "description": "Quality of life improvements for Askew.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icon-96.png",
    "default_title": "Askew Improved",
    "default_popup": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "hmmyes@example.com"
    }
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://askew.fuzzyastrocat.repl.co/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ]
}