Userscripts+

Userscripts+ is a Manifest V3 Chrome extension that runs classic `==UserScript==` scripts unchanged, with a CodeMirror editor, templates, the GM_* API and automatic update checks.

The side panel also inspects whatever site you're on: missing security headers, DNS records, subdomains from certificate transparency logs, editable cookies and storage, an exposed-path probe and a JWT decoder. A network tab captures fetch and XHR traffic, lets you edit a JSON or CSS response inline, and turns that edit into a userscript that replays it.