Sider Code rewrites other people's web apps from the browser in plain English.

A Chrome extension that reads a page, writes the code, and applies a persistent change described in words, with modifications saved across visits, toggleable and exportable (Product Hunt). 112 upvotes at #5. Demo cases are turning a comment section into a debate map, adding hover explanations for jargon, and rebuilding scattered threads as focused articles. The sharpest version yet of client-side patching as a substitute for a vendor's roadmap, and a support nightmare waiting for whoever owns the underlying site.