Hmm... if you remember, do you feel like at the time you were clicking repeatedly & very quickly to advance the dialogue? And could I also ask what version of Firefox? I really appreciate the help!
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I might have a clue: My laptop doesn't have much RAM(8 GB), so it's often low on memory. I ran the game, followed by using up almost all free RAM, and soon the game stuck. The version of Firefox was 81.0.
Maybe the quickest way to solve the problem is to close other programs and browser tabs before playing.