Real blocking.
No excuses.
A local Chrome extension that blocks distracting or inappropriate sites — with schedules, a focus timer, password lock, strict mode, and SafeSearch enforcement. Everything stays on your machine. No account, no server, no tracking.
Real blocking
Browser-level blocking via declarativeNetRequest. The block page loads before the site can render — no flash, no leak.
Schedules + focus timer
Set quiet hours by weekday or kick off a long focus session with a countdown. Focus survives a browser restart.
Password lock + strict mode
A password wraps the settings. In strict mode, the extension cannot be turned off — only uninstalled and reinstalled, which forces a deliberate decision.
SafeSearch enforcement
Google, Bing, YouTube, DuckDuckGo — Safe Search is forced at the URL level, independent of account settings.
Built for real use, not for show
Categories, schedule, allow/block lists, password, strict mode — one tidy options page, full RTL for Hebrew, clean LTR for English.
Install
Add from the Chrome Web Store. No registration, no account. The extension works from the moment it loads.
Configure
Pick categories, add custom domains, set a schedule, and choose a password if you want to lock the settings.
Browse in peace
When you try to visit a blocked site, a quiet page explains why and offers a way back. No nagging, no shame.
Free, and fully open source
Kosher Browser is MIT-licensed open source. All data is stored in your browser's IndexedDB. Zero network requests, zero analytics, no cloud component. You can verify it in Chrome DevTools.