Cool! Just this week I've been playing around using web chatbots to write userscript. So far, I've just been cutting/pasting code from ViolentMonkey's basic edit window - which is a clunky workflow and a real editor like VSCode would be great. Even though the script is quite short, I've already found I definitely need auto-rollback due to AI regressions. So this sounds very useful!

I use Firefox (on Win) but I guess it might be worth using Chrome just for write/test iteration and then copy over to FF. Looking just now it appears ViolentMonkey on Chrome died in the Manifest V3 apocalypse but is still on Edge.