Examine source code of Asana Subtask Expander

{
  "manifest_version": 2,
  "name": "Asana Expander",
  "version": "1.0",
  "description": "Expands all Asana Subtasks",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://app.asana.com/*"
      ],
      "js": [
        "expander.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d627eaec-d990-4a39-be00-dae8d1a48d63}"
    }
  }
}