Examine source code of Pomodoro Pixel Timer

{
  "manifest_version": 2,
  "name": "Pomodoro Pixel Timer",
  "version": "1.0",
  "description": "A pixel bar in the toolbar that fills over 25 minutes (Pomodoro). When full, notifies you to take a break.",
  "permissions": [
    "alarms",
    "notifications",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon.png",
    "default_title": "Pomodoro Pixel Timer"
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4dffe9d5-3060-4151-b8c0-eb5285b167d4}"
    }
  }
}