Shinkansen - Blazing fast web & YouTube translator Firefox

Shinkansen - Blazing fast web & YouTube translator

Shinkansen uses AI models to translate web pages and YouTube subtitles. Text is replaced in place to preserve the page layout, and connects directly to the AI model — your data never passes through any third party.

Features & Capabilities

Recent updates:

  • Added multi-language translation + multi-language UI: Traditional Chinese / Simplified Chinese / English / Japanese / Korean / Spanish / French / German
  • Added Instant Translation — press translate and see the page start turning into Chinese within 1 second (Gemini only)
  • Added Bilingual Mode — original and translation displayed side by side
  • Added Custom AI Models — connect to OpenRouter / Claude / DeepSeek / local Ollama, and any other model
  • Added AI Subtitle Re-segmentation — YouTube auto-generated subtitles are re-segmented by AI for more natural, readable Chinese
  • Added Blocked-word list — list of words you don't want in the translation.
  • Added Translate Article Opening Only — translate just the first N paragraphs as a preview to save tokens

Features:

  • Privacy first — connects directly to Google; no third-party servers in between
  • Open source — code is publicly available on GitHub for anyone to audit
  • Multi-language translation + multi-language UI — Traditional Chinese / Simplified Chinese / English / Japanese / Korean / Spanish / French / German

Web page translation • Instant Translation: press translate and see the page start turning into Chinese in 1 second — no waiting for the full API batch to return (Gemini only) • Translated segments are automatically cached; re-translating costs nothing next time • Two display modes: "Monolingual Overlay" replaces text in place, "Bilingual" shows original and translation side by side • Edit translations: after translation completes, edit the rendered text directly on the page to fix any awkward translations before exporting to PDF

YouTube subtitle translation • Real-time translation of YouTube subtitles into Traditional Chinese, matching native YouTube subtitle styling • AI-powered re-segmentation: auto-generated (ASR) subtitles are re-segmented by AI based on meaning, turning fragmented snippets into readable sentences • Bilingual subtitles: English + Chinese on two lines simultaneously — great for listening practice

Three translation hotkeys / three engines • Alt+A / Alt+S / Alt+D each map to a preset translation engine • Gemini AI (best quality, API key required) • Google Translate (free machine translation, no API key needed, even faster) • Custom AI Models (OpenAI-compatible — connect to OpenRouter / Claude / DeepSeek / Groq / local Ollama, hundreds of models)

Translation quality controls • Fixed glossary: force specific terms to always be translated to your chosen rendering (global + per-domain layers) • Customizable blocked-word list: an editable list of words you don't want in the translation. write your own substitution pairs. • Document-wide glossary consistency: names and proper nouns translated consistently throughout long articles • Translate opening only: translate the first few paragraphs as a preview before deciding whether to read the rest — major token savings Auto-translate and cross-page continuation • Auto-translate specified sites: add a domain, and pages on that domain are translated on entry • Cross-tab continuation: when you click a link from a translated page to open a new tab, the new tab is auto-translated and inherits the same preset

Usage tracking and cost-saving reports • Logs token count, cost, and cache hit rate for every translation, with charts and CSV export • Two-layer cache (local cache + Gemini implicit context cache); cache hit rate and actual savings are shown in real time after each translation completes

User Growth & Download Statistics

Manifest V3 Add-on
By:
Jimmy Su
Daily users:
92 13
Rating:
5.00
(4)
Version:
1.10.42 Last updated: 2026-06-09
Version code:
6298980
Creation date:
2026-04-30
Risk:
Very high risk impact High risk likelihood
Permissions:
Host permissions:
  • <all_urls>
  • https://generativelanguage.googleapis.com/*
  • https://translate.googleapis.com/*
Content scripts matches:
  • www.youtube.com
  • m.youtube.com
  • <all_urls>
  • youtube.googleapis.com
Size:
10.11MB
URLs:
Website
Full description:
See detailed description
Source:
Firefox Add-ons Store
Data ingested on:
2026-06-17
Compare stats and ranking:

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.
Developed by:
Jimmy Su
Firefox Add-ons Store
https://addons.mozilla.org/firefox/addon/shinkansen/
Website:
https://github.com/jimmysu0309/shinkansen/issues

User Reviews

by *****, 2026-05-06

by Fi*****, 2026-05-04

非常實用且安全的瀏覽器擴充功能!
by 林博*****, 2026-05-04
View all user reviews ›

Is Shinkansen - Blazing fast web & YouTube translator Safe?

Risk impact
Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Shinkansen - Blazing fast web & YouTube translator requires a lot of sensitive permissions. Exercise caution before installing.

Risk impact analysis details
  • Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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  • High ****** ********* ** * ****** ******** ******** ********** * ******* ******* *****
  • High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****
Risk likelihood
Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Shinkansen - Blazing fast web & YouTube translator is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details
  • High This extension was recently updated in the past month. New updates may not be stable or safe.
  • High **** ********* *** *** **** ****** ********* ********** *** *** ** ****** ** *****
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  • Good **** ********* *** **** **** *******
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