Examine source code of Buffer Enhancer

{
  "manifest_version": 2,
  "name": "Buffer Enhancer",
  "version": "1.0.0",
  "description": "Quality-of-life tweaks for Buffer: dark mode, wider composer, compact sidebar, and live character count. Toggle features from the popup.",
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "*://*.buffer.com/*"
  ],
  "browser_action": {
    "default_title": "Buffer Enhancer",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.buffer.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e60c2e68-d868-4c4b-8b68-68706b59e14f}"
    }
  }
}