Examine source code of CookieSession

{
  "manifest_version": 3,
  "name": "CookieSession",
  "version": "1.0.0",
  "description": "One-click separate cookies for the current tab, using a throwaway Firefox container.",
  "browser_specific_settings": {
    "gecko": {
      "id": "cookiesession@djekanovic",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "contextualIdentities",
    "cookies",
    "tabs",
    "browsingData"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "CookieSession",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}