The Firefox extension "Firefox Multi-Account Containers" by Mozilla has the exact features you mention. I've been using it ever since it was first released as a Firefox Test Pilot add-on and it's great! So awesome to be able to keep things segregated. Combined with the Tree Style Tabs and Tab Groups extensions, it's killer.
That said, Firefox 57 will kill the Tree Style Tabs and Tab Groups extensions, so hoping some browser like Doogie picks up those features and incorporates them into the browser core or at least as extensions.
That said, Firefox 57 will kill the Tree Style Tabs and Tab Groups extensions, so hoping some browser like Doogie picks up those features and incorporates them into the browser core or at least as extensions.
[1] https://addons.mozilla.org/en-US/firefox/addon/multi-account...