How to Select and Configure a Microphone in Firefox

Before you start

Firefox does not create its own microphone settings. It uses the input devices available through your operating system and controls which sites may access them. The microphone selection in Firefox is therefore a local browser action: you choose a device that the system has already detected, and Firefox requests permission before a site can use it. Operating-system permissions can still block access, so first confirm that the microphone is connected, enabled, and not disabled under the privacy settings of your operating system.

Step-by-step instructions

Open a website that asks for microphone access, such as a video call app or an audio recording tool. When the permission prompt appears, it lists the microphone devices that Firefox can see. If more than one input appears, select the desired device from the dropdown and choose Allow. Check the box to remember the decision if you want Firefox to keep that permission for the site.

Change a saved microphone choice

To update a decision later, select the shield icon in the address bar while the site is open. The control panel shows whether microphone access is allowed, blocked, or set to ask. Open the permission next to the microphone and set it to Allow or Block as needed. If the site should always ask again, choose that option from the same control.

Check site permissions

Open the Firefox menu and choose Settings. Select Privacy and Security, then find the Permissions section. Use the settings button beside Microphone to see the stored list of sites and change each entry to Allow, Block, or always ask. Removing a site entry clears the saved decision so the next visit behaves like a first access.

Check the output

After granting access, most call and recording tools show a live level meter in the browser. Speak normally and confirm that the input level moves. If the meter stays flat, Firefox may be using a different microphone than you expected, or the operating system may be blocking access. Audio quality also depends on the device and environment: the browser controls which input is selected, not noise suppression, sample rate, or recording quality. Background noise and the microphone's own characteristics remain the responsibility of the hardware and the operating system.

Common problems and next steps

If Firefox shows no suitable input device, the microphone has not been exposed correctly to the browser. Check the physical connection, then verify that the device appears in the operating-system sound settings and is not disabled. If the site is blocked despite a saved permission, review both the site permissions entry and the microphone access setting. A site may also require a secure connection before it can request microphone access.

When the wrong microphone is selected, update the choice from the site's existing permission prompt or the stored site entry. If the browser shows the correct device but another application is using it, close that application and reload the page. Where the operating system blocks the browser, enable Firefox in the system microphone or privacy settings, then restart Firefox and try the site again.

If the input level is present but the recording is quiet, adjust the input level in the operating-system sound settings rather than looking for a separate Firefox volume control. Any changes you make are reversible: a site entry can be removed, a blocked permission can be allowed, and Firefox can be returned to always ask before granting access.