Tenhou English UI is a Firefox extension designed to improve accessibility for non-Japanese speakers playing the popular online mahjong game, Tenhou. Supporting both English and French, this tool allows users to navigate the game interface in their preferred language, facilitating a more enjoyable gaming experience. By translating the UI elements, players can engage with the game without the hindrance of language barriers, making it particularly useful for those unfamiliar with Japanese.

This subscription-based extension falls under the Education & Reference category, specifically within Languages & Translation. While it significantly streamlines the gaming experience, it is important to note that Tenhou English UI is not compatible with the Flash client version of Tenhou. Through contributions from various individuals and groups, this extension aims to create a more inclusive environment for players worldwide.