Examine source code of New Tab Startpage

{
  "manifest_version": 2,
  "name": "Startpage",
  "version": "1.50resigned1",
  "description": "Custom Startpage for firefox",
  "icons": {
    "48": "icons/startpage-48.png"
  },
  "permissions": [
    "storage",
    "history"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "32": "icons/startpage-32.png"
    },
    "default_title": "Startpage"
  },
  "chrome_url_overrides": {
    "newtab": "popup/startpage.html"
  },
  "applications": {
    "gecko": {
      "id": "{ca6fa83e-3d6d-432d-a0d7-b060a69e8c68}",
      "strict_min_version": "54.0"
    }
  },
  "options_ui": {
    "page": "settings/settings.html",
    "open_in_tab": true
  },
  "web_accessible_resources": [
    "information/icon-example.jpg",
    "information/icon-example-id.jpg"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self';"
}