UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:47.0) Gecko/20100101 Firefox/47.0

Steps to reproduce the problem:
1. Create a source map file where a single statement in the source maps to multiple statements in the executed code.
2. In the debugger, navigate to the original source code.
3. Use "step over" to step through the code.

Alternatively, check out the example I prepared here: http://paulcuth.me.uk/starlight/source-map-step-issue/

What is the expected behavior?
The execution pauses on each statement in the displayed source code.

What went wrong?
The execution pauses on a statement and doesn't move on until many clicks of "step over" later.

Did this work before? N/A 

Chrome version: 52.0.2743.116 (Official Build) (64-bit)  Channel: n/a
OS Version: OS X 10.10
Flash Version: 

I believe that the execution is pausing on each statement in the generated file (which is not visible), rather than the source code which is displayed to the user.

FWIW, Firefox behaves in the expected manner.