Examine source code of Timeframe Sync

{
  "manifest_version": 3,
  "name": "Timeframe Sync",
  "version": "1.0.0",
  "description": "A floating widget showing timeframe countdowns and trading sessions.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Toggle Timeframe Sync",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "timeframesync@local.dev",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}