Examine source code of Water & Break Reminders

{
  "manifest_version": 2,
  "name": "Water & Break Reminders",
  "version": "1.7",
  "description": "Gentle nudges to drink water, stand up and stretch, and rest your eyes with the 20-20-20 rule. Turn each reminder on or off and set its own interval; notifications arrive while Firefox is open.",
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{6e4fbc01-56c8-41dd-9afa-b862342c95f9}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "alarms",
    "notifications",
    "storage"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "browser_action": {
    "default_title": "Water & Break Reminders",
    "default_popup": "src/popup.html",
    "default_icon": {
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "64": "icons/icon-64.png"
    }
  }
}