Currently I have a user complaining to me that his Firefox does not save the game. (There will be a signal in my game if the save is successful, and I know the game failed to save because the signal does not occur.) Other people's browsers are doing fine without any trouble.
What could be the reason for this? I could not reproduce this issue on my side, so I have to instruct the user to "dig" through his browser somehow. What are some of the tools that could be used to investigate save game data or the container housing the save game data?