Examine source code of Container Outgoing Links

{
  "manifest_version": 2,
  "name": "Outgoing Links in Default Container",
  "version": "0.2resigned1",
  "description": "When in a container, open outgoing links with different domains in the default container.",
  "permissions": [
    "<all_urls>",
    "cookies",
    "webRequestBlocking",
    "webRequest"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0e8093d5-1413-4aa8-972b-f54385f9795e}"
    }
  }
}