Examine source code of Custom Speed Dial

{
  "manifest_version": 3,
  "name": "Custom Speed Dial",
  "version": "3.4",
  "permissions": [
    "bookmarks",
    "storage",
    "tabs",
    "theme",
    "unlimitedStorage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "my-cool-speed-dial@extension.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}