Examine source code of Open in Colab

{
  "name": "Open in Colab",
  "description": "Open a Github-hosted notebook in Google Colab",
  "version": "1.1resigned1",
  "manifest_version": 2,
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "default_icon": "images/icon16.png",
    "default_title": "Open notebook in Google Colab"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "permissions": [
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{20a33ff8-2bca-4d0f-8095-1adcecd2e48a}"
    }
  }
}