A browser page cannot read other sites on its own, so the address goes through a small free helper that fetches the page and its stylesheets and sends back the raw text. The colours and fonts are worked out here in your browser. The helper keeps nothing. It has a free daily limit and a rate limit, so if it says it is busy, try again later. Some sites block bots or draw everything with JavaScript, and those can come back thin.
Other ways in (no helper needed)
Command line: run node cli/spy.js https://example.com (see the README) and drop the brand.json it makes here. Or: open the site, press Ctrl+U, select all, copy, and paste the source below.