UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36

Steps to reproduce the problem:
Run tmux on a Chrome Secure Shell session.

What is the expected behavior?
Using tmux with the -C (or -CC) flag should start tmux using native windows and panes using the Control Mode.

What went wrong?
Not only it does not work but it also hangs the terminal.

WebStore page: https://chrome.google.com/webstore/detail/secure-shell/pnhechapfaindjhompbnflcldabbghjo

Did this work before? N/A 

Chrome version: 58.0.3029.110  Channel: n/a
OS Version: OS X 10.12.5
Flash Version: 

This feature is implemented successfully in iTerm2. It works really well even on remote sessions on Linux hosts. Unfortunately iTerm2 is only available on OSX and because of that using it is not always an option.

There is some documentation about that in [1].

[1]: http://man7.org/linux/man-pages/man1/tmux.1.html#CONTROL_MODE