Examine source code of Multi Sessions

{
  "manifest_version": 2,
  "name": "Multi Sessions",
  "version": "1.0",
  "description": "Manage multiple sessions in separate containers.",
  "permissions": [
    "tabs",
    "cookies",
    "contextualIdentities",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon.png"
    }
  },
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "multisession@thedesigningworld.com",
      "strict_min_version": "88.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}