HearSub for Firefox by alex

Translate YouTube videos into English with AI dubbing and bilingual subtitles, generated as the video plays.

Available on Firefox for Android™

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About this extension

HearSub is a YouTube translation and AI dubbing browser extension. Translate subtitles and listen to natural AI voices in real time without downloading videos or waiting for full processing. Supports multiple languages, voice options, synced subtitles, playback speed, and progress syncing.

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Permissions and data

Required permissions:

Access your data for sites in the youtube.com domain
Access your data for sites in the bilibili.com domain

Optional permissions:

Access your data for sites in the youtube.com domain
Access your data for sites in the googlevideo.com domain
Access your data for hearsub.ai
Access your data for www.hearsub.ai

Required data collection, according to the developer:

Authentication information
Browsing activity
Website activity
Website content

Optional data collection, according to the developer:

Technical and interaction data