Firefox and the Mac each control camera and microphone access separately. Both must allow it.
1. Allow in Firefox
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Open Muzie in Firefox.
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Click the permissions icon at the left end of the address bar, next to
app.muzie.live. -
If Camera or Microphone shows Blocked, click the x beside it to clear the block.
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Reload the page (⌘R).
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When Firefox asks to allow the camera and microphone, click Allow.
If no prompt appears: right-click an empty part of the page, choose View Page Info, then Permissions. Under Use the Camera, untick Use default and choose Allow. Repeat under Use the Microphone. Close the panel and reload the page.
2. Allow on the Mac
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Open System Settings (Apple menu, top left of the screen).
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Click Privacy & Security, then Camera.
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Turn on Firefox.
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Go back, click Microphone, and turn on Firefox.
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Quit Firefox fully (⌘Q) and reopen it.
Apple's guide: Control access to the camera on Mac
3. Check it worked in Muzie
On the screen where you choose your devices, click refresh. Select your camera and microphone. You should see yourself, and the level bar under the microphone moves when you talk.
On an iPad or iPhone, use iPad & iPhone (any browser) instead — these steps do not apply there.