Examine source code of Pomodoro Timer

{
  "manifest_version": 2,
  "name": "Pomodoro Timer",
  "version": "1.1",
  "description": "A Firefox add-on to help you work efficiently using the Pomodoro principle.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_popup": "popup.html",
    "default_title": "Pomodoro Timer"
  },
  "permissions": [
    "notifications",
    "storage"
  ],
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{aef9112a-04ce-41d1-b02e-9fa98ba88dad}"
    }
  }
}