Examine source code of Tabby

{
  "manifest_version": 2,
  "name": "Tabby",
  "short_name": "Tabby",
  "version": "3.1.7",
  "description": "A simple new tab extensions",
  "chrome_settings_overrides": {
    "homepage": "index.html"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "icons": {
    "48": "images/favicon.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b95dddd7-a444-4cac-b348-ca6405b9409f}"
    }
  }
}