UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.82 Safari/537.36

Steps to reproduce the problem:
1. Open console at https://howlerjs.com/ (it isn't dependent on website, just an example of where I'v been seeing it).
2. Type the global Howler variable into the console and hit enter.
3. Sometimes an error is returned: Uncaught ReferenceError: Howler is not defined. Sometimes it will happen immediately after loading into the page, other times it can take several minutes or longer, and still other times it never happens.

What is the expected behavior?
These global variables are actually defined and still work in the page itself.

What went wrong?
The only issue is that the console can't access the variables. If you look at the window object it has been completely reset, but all of the code in the page continues to work correctly.

Did this work before? Yes Before Chrome 51

Chrome version: 52.0.2743.82  Channel: stable
OS Version: OS X 10.11.5
Flash Version: Shockwave Flash 22.0 r0