Examine source code of Add sticky notes to

{
  "manifest_version": 2,
  "name": "Sticky Notes",
  "version": "1.0",
  "description": "Add sticky notes to any webpage.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{68416aae-3a63-428b-bbc0-d7d79db720c1}"
    }
  }
}