Fix · Firefox

Microphone not working in Firefox: getting a call to hear you

Firefox remembers a yes or no about your microphone for each website, and can refuse every new site at once — so a call that cannot hear you is usually a saved Block somewhere.

What you are seeing

You join a video call in Firefox and the others cannot hear you, Firefox never asked about the microphone, or a crossed-out microphone shows in the address bar.

The likely causes, most common first

Work down the list; most people find theirs in the first two.

1. You blocked it once and Firefox remembered

  1. When a site first asks, Firefox offers a box to remember your answer. If you clicked Block with that box ticked, it keeps saying no without asking again.
  2. Click the permissions icon at the left of the address bar and press the X beside Blocked. Reload, and answer Allow this time.

Mozilla: “Click the X next to Allowed, Allowed Temporarily, Blocked or Blocked Temporarily to clear the status so that Firefox will ask again for permission when you next visit the site.” — support.mozilla.org/en-US/kb/how-manage-your-camera-and-microphone-permissions

2. Every new site is refused

  1. Open Settings → Permissions and data, scroll to Permissions, and click Microphone.
  2. If Block new requests asking to access your microphone is ticked, no new website can even ask. Untick it, or add the meeting site to the list as Allow, and save.

Mozilla: “Select the Block new requests asking to access your microphone checkbox if you do not want to give any other sites access to your microphone.” — support.mozilla.org/en-US/kb/how-manage-your-camera-and-microphone-permissions

3. The meeting site is saved as Block

  1. The same Microphone settings window lists every site with a saved answer. Find the one you meet on — meet.google.com, teams.microsoft.com, zoom.us — and switch it to Allow, then Save Changes.

Mozilla: “Firefox displays the websites with saved Allow or Block permission.” — support.mozilla.org/en-US/kb/how-manage-your-camera-and-microphone-permissions

4. The page never asks at all

  1. Some pages do not show a prompt. On the meeting page, open Page Info (Ctrl+I on Windows, Command+I on a Mac), choose Permissions, untick Use Default beside Use the microphone, and pick Allow.

Mozilla: “If a page does not prompt you for permission, you can use the Permissions panel in Firefox's Page Info window to set a custom permission for the Use the camera or Use the microphone setting.” — support.mozilla.org/en-US/kb/how-manage-your-camera-and-microphone-permissions

5. Your Mac has not let Firefox use it

  1. System Settings → Privacy & Security → Microphone, and switch Firefox on. Quit Firefox fully and open it again so it picks up the change.

Apple: “You can decide which apps are allowed to use the microphone.” — support.apple.com/guide/mac-help/control-access-to-the-microphone-on-mac-mchla1b1e1fe/mac

6. Windows has not let Firefox use it

  1. On Windows 11, open Settings → Privacy & security → Microphone and make sure both Microphone access and the switch for desktop apps are on. Firefox is a desktop app, so it is not listed by name.

Microsoft: “To use your microphone with apps on Windows 11, you'll need to turn on some permissions in Privacy & security settings.” — support.microsoft.com/en-us/windows/privacy/turn-on-app-permissions-for-your-microphone-in-windows

Every quote above is from Mozilla’s, Apple’s and Microsoft’s own help pages, read on 10 November 2026. Something changed? Tell us.

The longer guide, with more detail →

Other Firefox problems

Camera not workingIf your video is black in a Firefox call, look at Firefox’s saved answer for that site first, then at whether the computer lets Firefox near the camera, then at what else has it open.Screen share not workingSharing a screen from Firefox can be held up by Firefox’s own safety warning, by an old Firefox on a new Mac, or by macOS never having given Firefox permission to record the screen.Transcript missingA Google Meet transcript is saved to the organiser’s Drive, only starts from a computer or an Android phone, and waits for the host to join on the web.Recording missingGoogle Meet saves recordings to the organiser’s Drive, only records from a computer or an Android phone, and stops by itself after eight hours.Notes or summary missingGoogle’s automatic notes need an eligible plan, a meeting of about fifteen minutes or more in one supported language, and somebody from the host’s organisation to start them.Breakout rooms missingBreakout rooms in Google Meet need an eligible Workspace edition and a host on a computer, and Google never records what happens in them.

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