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Re:Show HN: I made a web-based, free alternative to Screen S... by skywal_l on Monday April 28, 2025 @04:32AM (#43818951)
Audio capture support apparently available on all desktop browsers except Firefox: https://developer.mozilla.org/en-US/docs/Web/API/MediaDevice...
Re:Show HN: I made a web-based, free alternative to Screen S... by naicuoctavian on Monday April 28, 2025 @07:23AM (#43820011)
System audio (i.e. Zoom calls) can be captured only on Chromium browsers on Windows and ChromeOS when sharing the entire screen; tab audio has wider OS support; Safari and Firefox do not support system or tab audio capture https://addpipe.com/docs/recording-client/screen-recording/#...

The MDN support table does not differentiate in this regard. (le: it actually does if you click to see the implementation notes)