UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.95 Safari/537.36

Example URL:
n/a; multiple

Steps to reproduce the problem:
1. Open a new tab (A), navigate to a URL 
2. Close tab A (maybe not necessary)
3. Switch to different tab B

(I can't reliably repro this; not entirely sure of the full steps.)

What is the expected behavior?
Tab B should display the website originally loaded in it

What went wrong?
Tab B displayed the contents of tab A

Does it occur on multiple sites: Yes

Is it a problem with a plugin? N/A 

Did this work before? Yes 

Does this work in other browsers? Yes

Chrome version: 55.0.2883.95  Channel: stable
OS Version: OS X 10.12.3
Flash Version: Shockwave Flash 24.0 r0