Re:How Firefox Got Fast Again
by idle_processor on Sunday November 19, 2017 @05:58PM
(#15736433)
In case anyone comes back and sees this thread, instructions for launching different profiles simultaneously can be found here: http://kb.mozillazine.org/Opening_a_new_instance_of_Firefox_...
The UX around multi-account containers is still being worked on, but the contextualIdentities WebExtension API (https://developer.mozilla.org/en-US/Add-ons/WebExtensions/AP...) allows add-ons to interact with containers, so a third party developer could create exactly the experience you've requested.