Examine source code of Water Intake Tracker v2

{
  "manifest_version": 2,
  "name": "Water Intake Tracker",
  "version": "1.0",
  "description": "Track your daily water intake to stay hydrated.",
  "icons": {
    "48": "icons/water-icon-48.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/water-icon-48.png",
    "default_popup": "water-tracker-popup.html",
    "default_title": "Water Intake Tracker"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3b33e609-21d3-45d1-8e14-8a9e046d8d7d}"
    }
  }
}