Examine source code of container commander

{
  "manifest_version": 3,
  "name": "container commander",
  "version": "0.5.2",
  "description": "Decides which container a tab opens in — once, at entry, from a policy your config repo owns.",
  "browser_specific_settings": {
    "gecko": {
      "id": "container-commander@sapn95.github.io",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextualIdentities",
    "cookies",
    "bookmarks",
    "menus"
  ],
  "optional_permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "options_ui": {
    "page": "popup/popup.html",
    "open_in_tab": true
  },
  "action": {
    "default_title": "container commander — move this tab",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png"
    },
    "default_popup": "switch/switch.html"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  }
}