Examine source code of Focussive

{
  "manifest_version": 2,
  "name": "Focussive",
  "version": "1.6",
  "description": "Replace your boring new tab with a soothing wallpaper and other utilities like adding countdown, focus and todos for the day.",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_action": {
    "default_icon": "favicon.png",
    "default_title": "Focussive"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fb5f7809-d7fa-48d5-8a93-c4825beaf03f}"
    }
  }
}