fumi

fumi is a Chrome extension + native messaging host that lets you run JavaScript in any web page and invoke scripts on your machine from it — all managed as plain files in your editor, under version control. Think Tampermonkey, but your userscripts can shell out to anything on your box. ⚠️ IMPORTANT — This extension alone is not enough. fumi bridges the browser and your host machine, so it also needs a native messaging host installed and configured on your Mac. Follow the setup steps below before use. ▼ REQUIREMENTS - macOS (Linux / Windows not supported) - Google Chrome with "Allow User Scripts" enabled on the extension's Details page ▼ SETUP (macOS only) 1. Install the binaries brew install --cask tkuramot/tap/fumi 2. Set up the native host and store fumi setup 3. Install this extension, then open its Details page and turn on "Allow User Scripts" (Chrome keeps this off by default — fumi needs it.) 4. Verify fumi doctor Full guide, docs & source code: https://github.com/tkuramot/fumi ▼ KEY FEATURES - Files, not a UI. Actions and scripts live in ~/.config/fumi/ — edit with your editor, track with git. - Any language for host scripts. fumi.run("foo.py", payload) — bash, Python, Go binary, whatever is executable. - Small, auditable surface. The host exposes exactly two operations: list actions, run a script. - Tampermonkey-style frontmatter. @match, @exclude — familiar and declarative. - Zero state in the browser. The extension is a thin runner; the filesystem is the source of truth.