Examine source code of Carbon Tab

{
  "name": "Carbon Tab",
  "description": "Data about the climate crisis, in your new tab.",
  "version": "1.0.5",
  "manifest_version": 2,
  "icons": {
    "48": "icons/icon_48.png",
    "128": "icons/icon_128.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab/newtab.html"
  },
  "applications": {
    "gecko": {
      "id": "firefox@carbon-tab.netlify.com"
    }
  }
}