WebGL Saving Issue

I have looked into saving with WebGL, and it seems everyone says to do this:

"The solution is to avoid using PlayerPrefs and Application.persistenDataPath and save to the path “idbfs/GAME_NAME_PLUS_UNIQUE_HASH” instead. You have to create this path and replace GAME_NAME_PLUS_UNIQUE_HASH with something unique of course."

However, I always get an "UnauthorizedAccessException" when trying to save. Is this a known issue that will be fixed soon?