U-NEXT Volume Booster

U-NEXT Volume Booster is an unofficial browser extension that boosts U-NEXT playback volume from 100% to 500%. It is useful when a video's audio is too quiet or difficult to hear, even when you do not want to increase your computer or speaker volume. Main features: • Adjust playback volume from 100% to 500% • Optionally remember your selected boost level • Automatically enable boosting for other videos and episodes • Works with U-NEXT's native fullscreen mode • Supports Japanese and English interfaces • Does not collect or transmit browsing history, playback information, personal information, or audio data How to use: 1. Play a video on U-NEXT. 2. Click the “BOOST” button displayed in the video player. 3. Open the extension popup and use the slider to adjust the boost level. Very high boost levels may cause audio distortion depending on the video and your speakers. Start with a lower boost level and increase it gradually. This is an unofficial extension and is not affiliated with U-NEXT Co., Ltd.