Examine source code of Container In tab title

{
  "manifest_version": 3,
  "name": "Container In  tab title",
  "version": "0.2",
  "description": "Modifies the Firefox tab title to prepend the current tab's container",
  "permissions": [
    "tabs",
    "contextualIdentities",
    "cookies",
    "scripting"
  ],
  "icons": {
    "64": "icons/tabtitle.png"
  },
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@tunsua",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}