Webpage Data Table Script

I have an existing page whose content is already loaded in the browser; I simply need a userscript—Greasemonkey, Tampermonkey, or an equally lightweight alternative—to read that local page markup, reorganise the information into a clean HTML table right there on the same page, and also let me export the result to Excel (CSV or XLSX is fine).

The table does not need a rigid template; a straightforward header-row / body-row structure works for me. What matters is that I can interact with it: I want to be able to both filter and sort any column without refreshing the page. Client-side JavaScript, plain ES6, vanilla DOM or a tiny helper like Tablesort.js is perfectly acceptable as long as the code stays self-contained.

Deliverables:
• Userscript file with clear in-code comments.
• One-click export function creating a downloadable file compatible with Excel.
• A brief read-me showing how to install the script and where to tweak column names if the page markup ever changes.

If you’ve done similar DOM-scraping or Tampermonkey automation before, this should be a quick job. I’m happy to provide the exact URL and sample markup once we start.