Hi @sales1,
Our Web SDK does not support Firefox for Computer Audio at the moment because we support Web Assembly and not WebRTC. Please refer to the first paragraph within our WebSDK introduction page for your reference[1]. To enable Computer Audio, Firefox would need to adopt Audio worklet API[2] similar to how Chrome or Edge already has[3].
1 - https://marketplace.zoom.us/docs/sdk/native-sdks/web
2 - https://developer.mozilla.org/en-US/docs/Web/API/Worklet
3 - https://developers.google.com/web/updates/2017/12/audio-worklet
Also, as a reminder that this forum is a friendly developer community forum and we strongly encourage everyone within this community be as friendly as possible to other members and staff.
Let us know if you have any further questions 
Thanks