Launching to HTML5 creates an 'uncaught exception: out of memory'.

After updating Binary to the latest CL to bypass the HTML5 issues of 3149070, I ran into an HTML5 issue. Launching onto HTML5 Firefox opens a new window with the message 'uncaught exception: out of memory'.

The output log does not display any errors or warnings, and the Running toast remains up as long as the new window does.

Repro:

1. Open a First Person BP project.
2. Click the dropdown beside launch and select Firefox.
3. Launch on to HTML5.

Expected Result: The game will launch into a window hosted in HTML5 free of issues.

Result: The game fails to launch into a window hosted in HTML5 and the user is instead given an 'uncaught exception' message.

Frequency: 3/3