Examine source code of HT Notes

{
  "manifest_version": 2,
  "name": "HT Notes",
  "version": "1.0.0",
  "description": "Create website-specific sticky notes that appear in the top-right corner",
  "permissions": [
    "activeTab",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png"
    },
    "default_title": "Toggle HT Notes"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "48": "icons/icon-48.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{24dab71f-f15f-43d4-a1a1-b9b95de42aa7}"
    }
  }
}