Examine source code of Writty

{
  "name": "Writty",
  "description": "An Open-source editor to help you focus on your writing",
  "version": "1.4.2",
  "manifest_version": 2,
  "browser_action": {
    "default_icon": {
      "16": "writty16.png",
      "24": "writty24.png",
      "32": "writty32.png",
      "48": "writty48.png",
      "128": "writty128.png"
    },
    "default_title": "Writty"
  },
  "icons": {
    "16": "writty16.png",
    "24": "writty24.png",
    "32": "writty32.png",
    "48": "writty48.png",
    "128": "writty128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}