Examine source code of Switch Container

{
  "manifest_version": 2,
  "name": "Switch Container",
  "short_name": "SwitchCon",
  "author": "MarsCat",
  "description": "Allows to switch the current tab to a different container.",
  "version": "1.3",
  "developer": {
    "name": "MarsCat",
    "url": "https://github.com/mjanetmars/switch-container"
  },
  "icons": {
    "48": "switch_container.svg",
    "96": "switch_container.svg"
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Switch Container",
    "default_icon": "switch_container.svg",
    "default_popup": "switch_popup.html"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "cookies",
    "contextualIdentities",
    "contextMenus",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c580e2d6-885a-4cb9-af49-59b3b48350e9}"
    }
  }
}