RunJS
Redefine any site with your own CSS & JS
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RunJS - Redefine any site with your own CSS & JS

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RunJS binds a target URL to optional CSS/JS you write. One click opens the page (redirects followed for that run) and injects after it lands. Local-first by default—no ads, no tracking, no remote script fetch. Optional Google Drive sync keeps your library in your Drive app data. Popup + Dashboard, Match patterns, import/export, 18 languages.

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Hey Product Hunt 👋 I’m the maker of RunJS — a Chrome extension to redefine how sites look and behave with your own CSS & JS, without editing the site’s source. What it does: • Bind a URL + optional CSS/JS → one click open & inject after the page lands • Local-first library (no ads / tracking / remote script fetch) • Optional Google Drive sync (your Drive app data, not our servers) • Dashboard editor + popup run list, Match patterns, import/export Needs Chrome 135+. On Chrome 138+, enable “Allow User Scripts” on the extension details page. Happy to answer questions — feature ideas welcome at .