Examine source code of SearchScene – New Tab

{
  "name": "SearchScene – New Tab",
  "version": "1.8",
  "description": "SearchScene is a search engine that donates 95% of its profits to charities, especially those that focus on climate change.",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "default_icon": {
      "16": "images/icon-16x16.png",
      "32": "images/icon-32x32.png",
      "48": "images/icon-48x48.png",
      "128": "images/icon-128x128.png"
    }
  },
  "icons": {
    "16": "images/icon-16x16.png",
    "32": "images/icon-32x32.png",
    "48": "images/icon-48x48.png",
    "128": "images/icon-128x128.png"
  },
  "chrome_settings_overrides": {
    "homepage": "https://www.searchscene.com/?ext=firefox-newtab&action=homepage"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "permissions": [
    "tabs",
    "cookies",
    "https://www.searchscene.com/*"
  ]
}