Firefox should do this by default, but, since it doesn't, I'm glad this Addon exists. Thank you! :)

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Buen Navegador

Love this add-on. Very happy to see a version that works with WebExt. Please take a look at how Nightly Tester Tools implements a similar feature: https://wiki.mozilla.org/QA/Automation/Projects/Addons/NightlyTesterTools

Integrating some of the Tester Tools "show profile" features into your new WebExt version would make it even more awesome. Please consider. Thanks for working on this add-on.

On Firefox 52 the renamed default profile name is no longer displayed and it blocks the sound with a wrong error message about installing pulseaudio. The newly created profile name is displayed and the sound works in it. On Linux.