Could you explain what you mean by this? Firefox does have profiles, and more than one can be active at a time. (There's also the newer containers feature which allows further compartmentalization.)
Chrome style profiles that are a 1st class feature; that isn't accessed with a secret url, doesn't require multiple instances of Firefox in my dock, can be toggled between profiles easily, can be easily identified with a icon in the top corner of the browser.
I heavily use the firefox containers feature which is awesome.
> that isn't accessed with a secret url, doesn't require multiple instances of Firefox in my dock, can be toggled between profiles easily
I think Firefox can do at least these three. You can permanently enable the profile manager on application startup (it's not in an about: page). You can also make shortcuts on your desktop / taskbar / etc directly to a profile with "firefox -p ProfileName". All Firefox instances are grouped into the same icon on the taskbar for me (Linux / KDE).
Granted, it could certainly be more user friendly, but it's proved rock solid for me for years now.
Could you explain what you mean by this? Firefox does have profiles, and more than one can be active at a time. (There's also the newer containers feature which allows further compartmentalization.)