MathLocker is a Firefox extension that blocks user-selected websites until a multiplication-table problem is solved. It combines basic focus control with short arithmetic practice and is intended for individual Firefox users.
MathLocker is a Focus & Pomodoro timers project. It focuses on reducing distracting website use by requiring users to solve multiplication problems before access. It is built as a consumer product for firefox users seeking a simple distraction blocker. It is available for free. It ships for the web, embeddable surfaces, Windows, macOS, and Linux.
It is developed by неважно, and it first shipped in 2026. Key capabilities include Website Blocking, Multiplication Problems, and Selected Site Rules. The interface is available in 32 languages, including Czech, German, and Greek. MathLocker is currently in beta.
Summary written by a language model from the project’s public pages.
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