Examine source code of newTab ebp

{
  "description": "Adds my own newtab with backgrounds",
  "manifest_version": 2,
  "name": "newTab",
  "version": "1.0.1",
  "icons": {
    "48": "icons/image-48.png"
  },
  "chrome_url_overrides": {
    "newtab": "./index.html"
  },
  "chrome_settings_overrides": {
    "homepage": "./index.html"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{81657eba-da81-4783-be5e-1344022c52ea}"
    }
  }
}