Examine source code of Marshmallow

{
  "manifest_version": 2,
  "name": "Marshmallow",
  "description": "Learn to control the time you spend on distracting web sites.",
  "version": "1.1.1",
  "permissions": [
    "tabs",
    "storage",
    "history"
  ],
  "options_ui": {
    "page": "index.html#/dashboard/settings",
    "browser_style": true,
    "chrome_style": true,
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "marshmallow@appfactories.com"
    }
  },
  "browser_action": {
    "default_icon": "./infinity-solid.svg",
    "default_title": "Marshmallow"
  },
  "background": {
    "page": "background.html",
    "persistent": true
  }
}