Data The Extension Reads

• Public YouTube chat author display names.
• Public YouTube chat message text.
• Public YouTube chat timestamps.
• Public avatar and emoji image URLs shown in YouTube chat.
• The YouTube video ID currently embedded in HoloSubs or opened in the active YouTube tab when the popup shortcut is shown.
• In Firefox only, the audio track from the currently embedded YouTube player after the user chooses Start audio.

Data The Extension Does Not Read

• OpenAI API keys, Supabase keys, or other HoloSubs server secrets.
• Google passwords, authentication codes, cookies, or private account tokens.
• Payment information.
• Browser history outside the explicitly listed YouTube and HoloSubs URL patterns.
• Page contents from unrelated websites.

Data Sharing

Chat packets are sent from YouTube pages to the extension service worker, then to open HoloSubs app tabs. The extension does not send chat packets to any separate analytics, advertising, resale, or third-party tracking service.

When Firefox audio capture is started, the extension sends the selected YouTube player's audio peer-to-peer to the open HoloSubs tab. HoloSubs then sends that audio to its configured speech transcription and translation provider to generate subtitles. The extension does not retain an audio recording.

Local State

The extension keeps a small in-memory buffer of recent chat packets and replay metadata so the bridge can reconnect reliably. This state is cleared when the extension service worker restarts, the browser restarts, or the user clicks Clear cache in the extension popup.