Examine source code of Dawn Directory

{
  "manifest_version": 3,
  "name": "Dawn Directory",
  "version": "1.0",
  "description": "Modifies the DayMap page theme.",
  "permissions": [
    "scripting",
    "activeTab",
    "storage",
    "tabs"
  ],
  "action": {
    "default_title": "Change theme? ",
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "icons/dawn16.png",
    "32": "icons/dawn32.png",
    "48": "icons/dawn48.png",
    "128": "icons/dawn128.png"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "https://*.daymap.net/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "charliedtbirbeck@gmail.com"
    }
  }
}