Examine source code of Tagged Requests Extension

{
  "manifest_version": 2,
  "name": "Tagged Requests Extension",
  "version": "1.0.1",
  "description": "Adds a header with metadata from current Firefox Multi-Account container",
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "contextualIdentities",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/icon-enabled-16.png",
      "48": "icons/icon-enabled-48.png",
      "128": "icons/icon-enabled-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-enabled-16.png",
    "48": "icons/icon-enabled-48.png",
    "128": "icons/icon-enabled-128.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0a760fab-6cfa-4cfc-8a9c-90bbcdf5dcf4}"
    }
  }
}