Examine source code of GCP project theme changer

{
  "manifest_version": 2,
  "name": "GCP project theme changer",
  "version": "1.0.0",
  "homepage_url": "https://github.com/CoCreate-SMWLucasO/GCP-prod-theme-firefox/",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://console.cloud.google.com/*"
      ],
      "js": [
        "/src/observer.js",
        "/src/storage.js",
        "/colorify.js"
      ]
    }
  ],
  "browser_action": {
    "browser_style": true,
    "default_title": "GCP project theme changer",
    "default_popup": "/pages/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{aea53b38-f0c7-4e51-8e4f-57323c5b17a0}"
    }
  }
}