BilingualTube - YouTube Bilingual Subtitles Watch YouTube videos with bilingual subtitles. Display original and translated subtitles simultaneously to improve language learning and video comprehension. Key Features: • Bilingual subtitle display - Shows original text and translation together • Official translation support - Uses YouTube's native translations when available • API translation fallback - Supports Microsoft Translator (no API key required) and OpenAI • Smart language detection - Automatically detects source language and handles language variants • Clean interface - Subtitles overlay directly on the video player How it works: 1. Install the extension 2. Open any YouTube video with subtitles 3. Configure your target language in the extension options 4. Bilingual subtitles appear automatically Translation Options: • Microsoft Translator - Free, no configuration needed • OpenAI - Requires API key, supports custom prompts and models Perfect for: • Language learners who want to see both original and translated text • Viewers who prefer subtitles in their native language • Anyone watching foreign language content The extension prioritizes official YouTube translations for better accuracy, and falls back to API translation when official translations are unavailable. Privacy: No data collection. All translation requests go directly to your chosen translation service. Open source project available on GitHub.