Cursor for Userscripts
I’ve been experimenting with embedding an Claude Code/Cursor-style coding agent directly into the browser. At a high level, the agent generates and maintains userscripts and CSS that are re-applied on page load. Rather than just editing DOM via JS in console the agent is treating the page, and the DOM as a file. The models are often trained in RL sandboxes with full access to the filesystem and bash, so they are really good at using it. So to make the agent behave well, I've simulated this environment. The whole state of a page and scripts is implemented as a virtual filesystem hacked…
Cursor for Userscripts launched on January 28, 2026 with 56 votes, #522 of 14,585 launches that month and more than 95% of that year's launches.
In plain words
Cursor for Userscripts is a browser tool that embeds an AI coding agent to generate and maintain userscripts and CSS modifications. Rather than editing the DOM directly, the agent treats webpages as files within a simulated filesystem stored in browser local storage. The agent can read, edit, and execute code using virtual bash commands, allowing it to persistently modify page behavior across reloads. Designed for users who want AI-assisted webpage customization.
written from the facts on this page · September 2026
From the sources
Coding agent for user scripts. Contribute to chebykinn/browser-code development by creating an account on GitHub.
Browser Code is a browser extension that gives Claude a virtual filesystem view of web pages. It generates, edits, and manages userscripts that persist to chrome.userScripts (the same API that Tampermonkey uses) and auto-run on matching URLs. /{domain}/{url-path}/ ├── page.html # Live DOM (read/edit triggers mutations) ├── console.log # Captured console output (read-only) ├── screenshot.png # On-demand page capture ├── plan.md # Agent's plan (plan mode) ├── scripts/ │ ├── my-script.js # Your scripts (persisted, auto-run) │ └── _auto_edits.js # Generated from DOM edits └── styles/ └── custom.css # Your styles (persisted, auto-injected) Version Tracking Files have version numbers for…from github.com
In the maker’s words, at launch
I’ve been experimenting with embedding an Claude Code/Cursor-style coding agent directly into the browser. At a high level, the agent generates and maintains userscripts and CSS that are re-applied on page load. Rather than just editing DOM via JS in console the agent is treating the page, and the DOM as a file.…
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