Examine source code of Presently

{
  "browser_specific_settings": {
    "gecko": {
      "id": "presently@jbzdarkid.github.io"
    }
  },
  "chrome_url_overrides": {
    "newtab": "presently.html"
  },
  "default_locale": "en",
  "description": "Displays the current weather & upcoming forecast on the new tab page.",
  "icons": {
    "128": "resources/icon-full.png"
  },
  "manifest_version": 3,
  "name": "Presently",
  "options_page": "presently.html?settings",
  "permissions": [
    "storage"
  ],
  "version": "1.2.6"
}