# CaptionGo – Live Captions & Dual Subtitles > Add dual subtitles & AI live captions to any web video with speech recognition. 30+ translation engines. Mobile & fullscreen. Canonical page: [https://chrome-stats.com/d/captiongo](https://chrome-stats.com/d/captiongo) ## Overview - **ID:** `captiongo` - **Platform:** Firefox - **Type:** Firefox add-on - **Status:** Available - **Publisher:** RabbitPair - **Category:** language-support,photos-music-videos,games-entertainment - **Daily users:** 423 - **Weekly downloads:** 263 - **Rating:** 1.00 / 5 (3 ratings) - **Version:** 1.0.26 - **Last updated:** 2026-08-28 - **First published:** 2026-06-25 - **Size:** 2.96 MB - **Data as of:** 2026-09-06 - **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/captiongo/) - **Website:** [https://www.rabbitpair.com/products/captiongo](https://www.rabbitpair.com/products/captiongo) - **Privacy policy:** [https://addons.mozilla.org/firefox/addon/captiongo/privacy/](https://addons.mozilla.org/firefox/addon/captiongo/privacy/) ## Description What can CaptionGo do? CaptionGo is a bilingual subtitle and AI live caption extension for Chrome, Edge, Firefox, and mobile browsers. It adds dual subtitles (original + translation) and real-time AI captions to any web video — streaming sites, online courses, live streams, video calls, and more. Works on mobile and in fullscreen. Designed for language learners, students, and anyone watching foreign-language content. Unlike tools that only translate an existing subtitle track, CaptionGo shows the original subtitle and its translation at the same time — and when a video has no captions at all, it transcribes the speech into real-time live captions using AI speech recognition (ASR). Core features are free forever, with an optional PRO upgrade. Free - Bilingual subtitles (Basic): turn on a site's captions and CaptionGo appends a translation line in place — ideal for learning a language by watching videos or learning English with TV shows and movies. - Free translation engines: a built-in on-device translator plus Google and Microsoft. - Automatic captions: turns on a site's own closed captions (CC) the moment playback starts, with per-site rules. - Live captions (speech-to-text): a free daily allowance transcribes audio for videos with no subtitles, using AI speech recognition (ASR). PRO - Advanced bilingual subtitles: read the original subtitle data for preloaded, no-wait, full-sentence translation on a dedicated overlay. - Full subtitle customization: font, size, color, background, outline, and on-screen position. - AI subtitle translation: connect your own AI provider such as OpenAI, Gemini, and DeepSeek for natural, context-aware results. - More live captions (ASR): extra usage and the option to use your own speech-to-text key. - Cross-device sync: end-to-end-encrypted cloud sync — set everything up on your computer, then just install and sign in on your phone. What sites are supported? Works across the web — streaming sites, Bilibili, Coursera, Udemy, TED, Twitch, X (Twitter), Zoom web, and any site with an HTML5 video player. Also works on mobile browsers (Android Firefox, Android Edge) and in fullscreen mode. Who is CaptionGo for? - Language learners — learn English (or any language) by watching videos with bilingual subtitles and AI translation - Students — auto-generated live captions for online courses, lectures, and educational videos - Live stream & meeting viewers — real-time AI captions for Twitch, X Spaces, Zoom, and any live content without subtitles - Foreign content viewers — dual subtitles for movies, anime, K-dramas, news, and livestreams in any language - Subtitle-less content — AI speech recognition generates real-time captions for videos without subtitles Install CaptionGo to add bilingual dual subtitles and AI live captions to any video. ## Rankings - #5,575 — Overall - #232 — Language Support - #15 — options - #40 — live - #79 — speech - #162 — deepseek ## Permissions and access ### Permissions - `activeTab` - `contextMenus` - `scripting` - `storage` - `unlimitedStorage` - `tabs` - `webRequest` - `` ## Safety - **Risk impact:** High risk impact - **Risk likelihood:** High risk likelihood ### Analysis details - Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern. - This extension was recently updated in the past month. New updates may not be stable or safe. > Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing). ## Similar extensions and apps - [Live Subtitle & Translator](https://chrome-stats.com/d/live-subtitle-translator) — 106 users - [FlashCaption - Live Captions](https://chrome-stats.com/d/flashcaption-live-captions) — 305 users, 1.00 / 5 - [vCaptions – Video Caption List](https://chrome-stats.com/d/vcaptions-video-caption-list) — 96 users - [SubText](https://chrome-stats.com/d/subtext) — 15 users, 5.00 / 5 - [AI Subtitle Translator](https://chrome-stats.com/d/ai-subtitle-translator) — 19 users - [Mira Translator - Web Translation](https://chrome-stats.com/d/mira-translator) — 45 users, 5.00 / 5 - [YouTube Bilingual Subtitles — AI](https://chrome-stats.com/d/youtube-bilingual-subtitles-ai) — 2 users - [LiveCaption](https://chrome-stats.com/d/liveccaption) — 27 users, 1.00 / 5 - [Youtube Dubbing](https://chrome-stats.com/d/youtube%E4%B8%AD%E6%96%87%E9%85%8D%E9%9F%B3) — 3,264 users, 3.92 / 5 - [YouSub](https://chrome-stats.com/d/yousub) — 12 users - [VoxSub](https://chrome-stats.com/d/voxsub) — 13 users, 5.00 / 5 - [Lingopede](https://chrome-stats.com/d/lingopede) --- Source: [Chrome-Stats](https://chrome-stats.com/d/captiongo)