[kaixi]

The ability to use multiple accounts of Gmail, Trello, Bitbucket, whatever service you use in a single window. I happen to use the same services for work and for private purposes and it's inconvenient having to log in and log out all the time.

You can sorta do the same in Chrome by creating a full separate profile and opening an extra window, but then your passwords and bookmarks are separated as well. It's a pain in the ass.