1899831 - recording.zencastr.com - Website not supported on Firefox

Status: NEW

(Web Compatibility :: Site Reports, defect, P2)

Description

[James Graham [:jgraham]]

Environment:
Operating system: Mac OS X 10.15
Firefox version: Firefox 124.0

Steps to reproduce:
Zencastr reports Firefox is an unsupported browser, and has since early 2021. The current site message says:

Unsupported Browser

Sorry, your browser doesn't support the necessary APIs required for Zencastr to work.

Please return in one of these browsers on your desktop or laptop computer

Download Chrome
Recommended

Download Brave

Download Edge

If you are already using one of these browsers and still getting this message, please make sure your browser is updated to the latest version and that you

There is a blog post from February 2021 announcing the dropping of Firefox support:

https://blog.zencastr.com/blog/2021/2/16/zencastr-is-launching-video-recording-into-open-beta

It says "... we found that many of the APIs that we needed to make the highest quality audio and video in the most secure way possible are not currently supported by Firefox." but does not say what those APIs are.

Actual Behavior:
Browser unsupported

Notes:

• Reproduces regardless of the status of ETP
• Reproduces in Firefox Nightly, and Firefox Release
• Does not reproduce in Chrome

Created from https://github.com/webcompat/web-bugs/issues/135597

Comment 1

[Jim Mathies [:jimm]]

Attachment: js console errors

Comment 2

[Jim Mathies [:jimm]]

Attachment: Started recording canvas_recor.txt

Comment 3

[Jim Mathies [:jimm]]

Spoofing, I see errors related to insertable streams usage. While we plan to implement this based on current spec, there's no assurance it will work since Google also added non-standard audio support to these apis. Although once we have the spec apis, it'll probably be simpler for them to add Firefox support.

https://mozilla-hub.atlassian.net/browse/FFXP-3016

Comment 4

[Jan-Ivar Bruaroey [:jib] (needinfo? me)]

This blog post contains polyfills for Chrome's API that might help https://blog.mozilla.org/webrtc/unbundling-mediastreamtrackprocessor-and-videotrackgenerator/