Examine source code of Water Reminder

{
  "manifest_version": 2,
  "name": "Water Reminder",
  "version": "1.1",
  "author": "Ali Hassan",
  "description": "A Water Reminder and Tracking Extension which shows desktop notifications.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "storage",
    "notifications",
    "contextMenus"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "options_page": "notification_options.html",
  "background": {
    "scripts": [
      "notification_background.js",
      "eventPage.js"
    ],
    "persistent": false
  },
  "web_accessible_resources": [
    "icon.png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5f4637bb-6970-4613-b048-87537fd22fcb}"
    }
  }
}