NihongoTube

The ultimate Japanese immersion building tool for YouTube.

NihongoTube is the ultimate extension for building Japanese immersion on YouTube. Distracting video recommendations, no more! With this extension all the recommended content you will see on YouTube will be in your target language Japanese. Highlights: 💪Support for filtering 10+ types of recommendations, content and pages. 🗃️JLPT level estimation for videos to help you find content for your target level. 🗾Recommended channels on the home page to get you started. 📱Mobile support on Firefox for Android. 🔢Metrics to see how effective filtering is. 💬Video comment filtering for full immersion! ✅Dynamic toggle for when you want non-Japanese recommendations back again. Complete Feature Set: • Light & dark mode support. • Filtering of video comments and search results. • Curated channel recommendations on the home page. • Filtering of video recommendations across YouTube. • Auto-navigation prevention on non-Japanese recommendations. • JLPT level estimation on videos and some recommendations. • Reveal buttons to show hidden comments and search results. • System UI language support for English, Chinese and Japanese. 💬Discord Join the community, report bugs or request features. https://discord.com/invite/TVHH8e9UyQ 📱Mobile (Firefox for Android) Enjoy NihongoTube on mobile with Firefox for Android! Simply install Firefox on your Android device then visit the NihongoTube Firefox extension page. ---------------------------------------------------------------------------------------------------------- CHANGE LOG ---------------------------------------------------------------------------------------------------------- Version 4.3.3 Change List (15/11/25) • Feature: added system UI support for Hindi. • Fix: resolved issue with video preview playback on home/subs pages. • Fix: potential freeze on channel navigation. • Fix: empty video shelf notification is now more reliable. Version 4.2.3 Change List (13/11/25) • Feature: system icon now toggles based on master switch state. • Feature: 5 new recommended channels. • Fix: expanded word dataset to improve level estimate accuracy. • Fix: added weighting for repetition to tune JLPT level estimates on N5 videos. • Fix: adjusted JLPT level weighting for short videos mismarked as N5. • Fix: guard against the comment reveal button duplicating. • Fix: improvements to channel filtering during channel navigation. • Fix: metric saving now works again. Version 4.1.0 Change List (09/11/25) • Feature: mobile support on Firefox for Android! • Fix: added an indicator when JLPT level is unavailable. • Fix: tweaking for JLPT level estimates in the N3-N5 bracket. • Fix: filtering for movie and new short format in video side bar. • Fix: subscription page filtering toggle working again. • Fix: bug in channel filtering (via navigation) resovled. • Fix: issue with JLPT level UI duplicating on videos. Version 3.0.1 Change List (05/11/25) • Support for localized store listings. Version 3.0.0 Change List (05/11/25) • Feature: system UI language support for Chinese & Japanese added! • Feature: filtering now stops end-of-video auto-navigation if the target video is not Japanese. • Fix: search result JLPT level is correctly readded after back navigation. • Fix: improved speed for untranslation layer by 6x. Version 2.0.0 Change List (04/11/25) • Feature: JLPT level can now be found on the home & subscription page! • Fix: tweaks to improve JLPT level estimate accuracy. • Fix: untranslate video titles to improve filtering accuracy. • Fix: caching improvements to improve performance over long sessions. Version 1.10.0 Change List (31/10/25) • Feature: JLPT level can now be found on video sidebar recommendations! • Feature: Added a link to our Discord to the settings popup. • Fix: improvements to JLPT level accuracy. • Fix: improvements to settings toggle behaviour. Version 1.9.2 Change List (30/10/25) • Feature: filtering now applied to auto-generated channels! • Fix: updated endscreen filtering following new YouTube layout. • Fix: handle filtering false-positive with fypシ hashtag. • This release also includes an extensive rewrite to enable more cool features to come. Version 1.8.1 Change List (26/10/25) • Feature: added a refresh button to channel recommendations. • Fix: removed 'open settings' button from explore notification. • Fix: fixed channel video filtering following changes in v1.7.0. • Fix: various extension performance and error handling improvements. Version 1.7.0 Change List (25/10/25) • Feature: button added to reveal hidden search results. • Fix: page load times improved by 2.5x! • Fix: playlists are now filtered on the search page. • Fix: empty content shelves are now filtered on the search page. • Fix: resolved edgecase in Japanese language detection involving kaomoji. • Feature: added an on-install welcome page. Version 1.6.0 Change List (21/10/25) • Feature: added filtering for search results! • Fix: more JLPT level estimation tuning. • Fix: performance improvements. Version 1.5.0 Change List (19/10/25) • Feature: JLPT level estimates now appear on search results. • Feature: 4 new recommended channels added. • Feature: Ko-fi support button added. • Fix: JLPT level estimation tuning for music. • Fix: JLPT level estimate now correctly appears on Firefox. Version 1.4.4 Change List (14/10/25) • Fix: 'reveal comment' button now uses correct highlight colour in light-mode. Version 1.4.3 Change List (13/10/25) • Feature: added a 'reveal comments' button to show filtered comments. • Fix: addressed a known warning associated with loading video transcripts. • Fix: reload handling improvements. Version 1.3.1 Change List (11/10/25) • Fix: corrected menu colours on firefox. Version 1.3.0 Change List (09/10/25) • Feature: videos now display an estimated JLPT level. Version 1.2.5 Change List (04/10/25) • Fix: improved how filtering deactivates on page navigation. • Feature: added 3 new recommended channels. Version 1.2.4 Change List (28/09/25) • Fix: alignment of videos on the home & subscription page. Version 1.1.2 Change List (22/09/25) • Fix: filtering for subscription page following YouTube update. Version 1.1.1 Change List (28/08/25) • Fix: filtering for home and related pages following YouTube update. Version 1.1.0 Change List (25/08/25) • Feature: added recommended Japanese channels to home page. • Feature: added channel home page filtering. • Feature: added channel shorts page filtering. • Fix: addressed false positive with '#fypシ゚'. • Fix: empty shorts containers are now properly hidden. • Fix: no content notification on channel video section now hides after toggle off. • Fix: navigating backwards to a channel now reapplies filtering.