2D demo WebGL error

Hi all, I'm trying to run the 2DJumpAndRun demo. It works fine in the editor, but when I try launching it in WebGL I get the following output from Firefox 43 in W10: pastebin.com/ay6BPGaz

My directory structure is as such:
/Assets
/Game
/Demo2DJump.unity
/Scripts
/...etc

/PUN
/Resources
/PhotonServerSettings.asset

/Plugin
/PhotonNetwork
/Websockets
/...etc