Examine source code of FocusOwl

{
  "manifest_version": 2,
  "name": "FocusOwl",
  "author": "Erlend Eelmets",
  "version": "2.0",
  "description": "FocusOwl is a timer extension that allows you to focus on your work and take a break when needed. It is based on the Pomodoro technique.",
  "icons": {
    "36": "icons/owl.svg",
    "48": "icons/owl.svg",
    "72": "icons/owl.svg",
    "96": "icons/owl.svg",
    "144": "icons/owl.svg",
    "192": "icons/owl.svg"
  },
  "browser_action": {
    "default_icon": {
      "36": "icons/owl.svg",
      "48": "icons/owl.svg",
      "72": "icons/owl.svg",
      "96": "icons/owl.svg",
      "144": "icons/owl.svg",
      "192": "icons/owl.svg"
    },
    "default_title": "FocusOwl",
    "default_popup": "popup/index.html"
  },
  "background": {
    "scripts": [
      "background/timer.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1471079c-394e-4486-a5f9-1cd7285a8b17}"
    }
  }
}