UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/51.0.2704.79 Chrome/51.0.2704.79 Safari/537.36

Steps to reproduce the problem:
It's simple: you received push (facebook, mail, whatever) during your break, but when you come back to your PC you don't seen any notice because push was closed automatically.

What is the expected behavior?

What went wrong?
Wrong is that push haven't duration option. I offer to set timer option for push and add "do not close push automatically" option.

Did this work before? No 

Chrome version: 51.0.2704.79  Channel: n/a
OS Version: 
Flash Version: Shockwave Flash 11.2 r999