Examine source code of Multi-Session Launcher

{
  "manifest_version": 2,
  "name": "Multi-Session Launcher",
  "version": "1.3",
  "description": "Open websites in separate containers like SessionBox. Now with saved sessions!",
  "permissions": [
    "tabs",
    "contextualIdentities",
    "storage"
  ],
  "browser_action": {
    "default_title": "Launch URL in Container",
    "default_popup": "popup.html",
    "default_icon": "icons/logo_64.png"
  },
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b4b0f79f-0452-422e-a052-7c18a91e6f17}"
    }
  }
}