Firefox Teams Setup

Microsoft Teams v2 web application has compatibility issues with Firefox on Linux due to stricter media handling policies. This document covers the required configuration to enable full functionality.

Symptoms

• Unable to start or join calls in Teams v2 web on Firefox
• Same functionality works in Chromium-based browsers (Brave, Chrome)
• Root cause: Firefox’s stricter autoplay and WebRTC policies

Required Configuration

Enable Autoplay

Navigate to Firefox Settings → Privacy & Security → Autoplay and set to Allow Audio and Video. Alternatively, add a site-specific exception for https://teams.microsoft.com.

WebRTC Settings

Open about:config and verify the following settings:

• media.peerconnection.enabled = true
• media.peerconnection.ice.proxy_only = false
• media.navigator.permission.disabled = false
• media.getusermedia.audiocapture.enabled = true

Important Notes

“Always ask” permission settings can still break Teams functionality even when the above settings are correct. Firefox enforces stricter policies than Chromium, and Teams v2 expects both autoplay permissions and pre-enabled WebRTC to function properly.

This configuration complements Firefox GPU acceleration settings for optimal browser performance.

References

• Firefox Teams Setup