Packaged Project fails to load on Firefox with QuotaExceededError

Error message is displayed on Firefox 52.0.2 (64-bit)

QuotaExceededError
TypeError: eventHandler.target is null
QuotaExceededError

This is a regression from 4.15.2 and does not occur on Chrome.

1. Create a new BP FirstPerson template project
2. Packaged for HTML5
3. Run the HTML5LaunchHelper.exe
4. Open Firefox and navigate to localhost:8000
5. Click on <Your project name>.html

Result: error message is displayed