Examine source code of Sleep Tracker

{
  "manifest_version": 2,
  "name": "Sleep Tracker",
  "version": "1.0",
  "description": "Track your sleep patterns and improve your sleep habits.",
  "icons": {
    "48": "icons/sleep-tracker-icon-48.png"
  },
  "permissions": [],
  "browser_action": {
    "default_icon": "icons/sleep-tracker-icon-48.png",
    "default_popup": "popup.html",
    "default_title": "Sleep Tracker"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2ef3c0f5-f52a-46da-a653-8387d52da9c6}"
    }
  }
}