Examine source code of Switch Container Plus

{
  "manifest_version": 2,
  "name": "Switch Container Plus",
  "short_name": "SwitchConPlus",
  "author": "stoically",
  "description": "Allows to switch the current tab to a different container in multiple ways",
  "version": "0.19",
  "icons": {
    "48": "switch_container-48.svg",
    "96": "switch_container-96.svg"
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Switch Container",
    "default_popup": "switch_popup.html",
    "default_icon": {
      "16": "switch_container-browseraction-16.svg",
      "32": "switch_container-browseraction-32.svg"
    },
    "theme_icons": [
      {
        "light": "switch_container-browseraction-dark-16.svg",
        "dark": "switch_container-browseraction-16.svg",
        "size": 16
      },
      {
        "light": "switch_container-browseraction-dark-32.svg",
        "dark": "switch_container-browseraction-32.svg",
        "size": 32
      }
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "permissions": [
    "tabs",
    "activeTab",
    "cookies",
    "contextualIdentities",
    "storage"
  ],
  "background": {
    "scripts": [
      "psl.min.js",
      "background.js"
    ]
  },
  "omnibox": {
    "keyword": "co"
  },
  "applications": {
    "gecko": {
      "id": "{d5ac33ed-723c-402b-b17c-e7bbb0d3a80d}",
      "strict_min_version": "57.0"
    }
  }
}