A 230-Line Chrome MV3 Extension That Copies the Page Selection as Markdown — Without `<all_urls>`

Engineers paste into Markdown destinations all day — GitHub Issues, dev.to, Notion, Obsidian — but the browser's "Copy" command writes HTML to the clipboard, and that HTML lands as escaped tags or stripped formatting. Here's a Chrome MV3 extension that does the obvious thing: convert the selection to Markdown before it hits the clipboard. 230 lines of vanilla JS, 35 jsdom-backed tests, no host_permissions . 🧩 Demo : https://sen.ltd/portfolio/copy-as-md/ 📦 GitHub : https://github.com/sen-ltd/co