Time and time again I try to switch to Firefox. But it always seems to fall short (for me at least). I rely too much on separate profiles to disconnect work-related browsing from personal browsing. Separate bookmarks, sessions, browser plugins, sync preferences etc... A UI that's as powerful is literally all that is needed for me anyway. Its such a shame they've neglected the Profile Manager.
What exactly prevents you from using Firefox profiles? They are working fine, for me at least. I can't see a reason for Firefox devs to be ashamed.
With Firefox I get just-a-browser, and I need more than that. If Firefox had a way for me to manage the browser across devices it would be more viable for me.