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They tried but Slack weren't interested. Update from 2 years ago To summarize my current understanding: Slack's video conferencing service only support Chrome'

They tried but Slack weren't interested. Update from 2 years ago To summarize my current understanding: Slack's video conferencing service only support Chrome's non-standard Plan B format for WebRTC calls. And our attempts to talk to Slack about changing that were kindly rejected (we met with them shortly after they had launched the calling feature). And my repeated questions in public events about adding Firefox support were also turned down. Source: https://bugzilla.mozilla.org/show_bug.cgi?id=1626121#c4 https://bugzilla.mozilla.org/show_bug.cgi?id=1626121#c4 Further clarification from last year https://bugzilla.mozilla.org/show_bug.cgi?id=1626121#c10 https://bugzilla.mozilla.org/show_bug.cgi?id=1626121#c10 I have seen people mention that they have tried few more times to contact them, but Slack weren't interested. My understanding as to why it works now, correct me if I am wrong, is because of Slack moving to using AWS Chime SDK for calls which has Firefox support and just faking the UA to Chrome tricks Slack into loads the necessary SDK/JS for calls and Chime SDK takes care of the rest.

shmerl 5y ago
Such kind of attitude from Slack is disgusting.
splatzone 5y ago
I'm very confused - if it's working on Firefox with the Chime SDK, what good reason is there for Slack to block the feature on Firefox? Is there some political reason for them to disadvantage Firefox that I'm not aware of?
- usrlocal1023 5y ago
  When Slack launched video calls, it was using Chrome's own implementation of WebRTC which is called Plan B. So it worked in both their app which is electron based and Chrome. Not sure if it worked with chromium derivatives like Brave, Vivaldi, etc. Firefox rolled out the standard based WebRTC implementation and chrome eventually did as well, but companies like Slack and various others didn't migrate instead just threw an error message saying calling isn't supported in Firefox and instead use their app or chrome. Since Slack's partnership with AWS about 2 years ago, they migrated from their own call infrastructure to using AWS's Chime. Chime SDK has support for all major browsers https://docs.aws.amazon.com/chime/latest/dg/meetings-sdk.html#mtg-browsers https://docs.aws.amazon.com/chime/latest/dg/meetings-sdk.htm... But their browser check still remains today and Mozilla started to spoof the user agent as a workaround so that Firefox users can make calls as Slack aren't willing to remove the check or properly add support. Chrome is planning to remove WebRTC plan B soon, so this should force companies to use the unified WebRTC implementation and hopefully means Firefox support. https://groups.google.com/a/chromium.org/g/blink-dev/c/IY2amIigFFs https://groups.google.com/a/chromium.org/g/blink-dev/c/IY2am...
  - splatzone 5y ago
    Thank you
thayne 5y ago
Sadly, this behavior is somewhat common for many sites that block firefox based on the user agent. At least form some webcompat bug issues I've looked at.

shmerl 5y ago

Such kind of attitude from Slack is disgusting.

splatzone 5y ago

I'm very confused - if it's working on Firefox with the Chime SDK, what good reason is there for Slack to block the feature on Firefox? Is there some political reason for them to disadvantage Firefox that I'm not aware of?

usrlocal1023 5y ago
When Slack launched video calls, it was using Chrome's own implementation of WebRTC which is called Plan B. So it worked in both their app which is electron based and Chrome. Not sure if it worked with chromium derivatives like Brave, Vivaldi, etc. Firefox rolled out the standard based WebRTC implementation and chrome eventually did as well, but companies like Slack and various others didn't migrate instead just threw an error message saying calling isn't supported in Firefox and instead use their app or chrome. Since Slack's partnership with AWS about 2 years ago, they migrated from their own call infrastructure to using AWS's Chime. Chime SDK has support for all major browsers https://docs.aws.amazon.com/chime/latest/dg/meetings-sdk.html#mtg-browsers https://docs.aws.amazon.com/chime/latest/dg/meetings-sdk.htm... But their browser check still remains today and Mozilla started to spoof the user agent as a workaround so that Firefox users can make calls as Slack aren't willing to remove the check or properly add support. Chrome is planning to remove WebRTC plan B soon, so this should force companies to use the unified WebRTC implementation and hopefully means Firefox support. https://groups.google.com/a/chromium.org/g/blink-dev/c/IY2amIigFFs https://groups.google.com/a/chromium.org/g/blink-dev/c/IY2am...
- splatzone 5y ago
  Thank you

thayne 5y ago

Sadly, this behavior is somewhat common for many sites that block firefox based on the user agent. At least form some webcompat bug issues I've looked at.