Examine source code of Toothache Diary

{
  "manifest_version": 2,
  "name": "Toothache Diary",
  "version": "1.0",
  "description": "Log and track toothache episodes to discuss with your dentist.",
  "icons": {
    "48": "icons/toothache-icon-48.png"
  },
  "permissions": [],
  "browser_action": {
    "default_icon": "icons/toothache-icon-48.png",
    "default_popup": "popup.html",
    "default_title": "Toothache Diary"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{96718fe9-c63f-48fd-9a9e-72bc10aba97a}"
    }
  }
}