Examine source code of Hootsuite Enhancer

{
  "manifest_version": 2,
  "name": "Hootsuite Enhancer",
  "version": "1.0.0",
  "description": "Quality-of-life tweaks for Hootsuite: dark mode, wider composer, compact sidebar, and live character count. Toggle features from the popup.",
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "*://*.hootsuite.com/*"
  ],
  "browser_action": {
    "default_title": "Hootsuite Enhancer",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.hootsuite.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{dee1d2a9-ca62-468c-8c01-f2faf8b7a9cc}"
    }
  }
}