[kevincox]

You misunderstand, you have the situation exactly backwards. The problem isn't that Firefox doesn't support these APIs, it does support them and the problem isn't that they are limited to specific domains, they aren't. The problem is that the Slack code is `if isChrome() { enableCalls() }`. Mozilla has to spoof the user-agent to bypass this check. Joe's Voice Calls.com will just do no conditional or do feature-detection rather than user-agent checks and everything will work fine.

The exception is the list of domains that allow auto-play video with sound by default (like YouTube) but I think there are very few instances of this.

[meetups323]

Ah, indeed I misunderstood. Though to be fair, at $DAY_JOB we had to do exactly the process I described above to access some API (not auto-play) without a litany of obnoxious prompts. If anyone at a smaller company tried to do what we were doing, they'd be 100% unable to provide a usable experience for Firefox users.