UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.104 Safari/537.36

Steps to reproduce the problem:
1.  Recorded a video in Chrome (getUserMedia - video/webm) uploaded video to amazon s3 storage. 

2.  Load the video using firefox using the direct url to the video/webm file.

See:

https://s3-us-west-2.amazonaws.com/boldvue-video-dev/VideoBlob/6ECCgXnZYC9cujaat/6c6caa44f60f56ce027b0ae3.webm

What is the expected behavior?
I would expect it to play the the video/webm file generated by chrome.

Load the same url in chrome and it plays:
https://s3-us-west-2.amazonaws.com/boldvue-video-dev/VideoBlob/6ECCgXnZYC9cujaat/6c6caa44f60f56ce027b0ae3.webm

This is causing major issues with cross browser functionality.  I can only support chrome or firefox but not both, chrome users who upload videos won't be accessible by firefox users.  Though firefox recordings are loadable in chrome.

What went wrong?
I get an error:

1.  from the logs:
Media resource https://s3-us-west-2.amazonaws.com/boldvue-video-dev/VideoBlob/6ECCgXnZYC9cujaat/6c6caa44f60f56ce027b0ae3.webm could not be decoded.

2.  In the browser I see the following:
No Video with supported format and MIME type found.
or 
Video format or MIME type is not supported.

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 59.0.3071.104  Channel: n/a
OS Version: OS X 10.12.5
Flash Version: 

Now i'm not sure if this is a Firefox Issue or a Chrome issue, but the WEBRTC video signature obviously doesn't match what firefox expects.  Or firefox does not detect it as an .webm video that it can play.

I also added this bug to firefox's bugzilla, nothing but crickets so far.  Please help.