There were two Firefox complaints before this one. I believe they were both from the same guy. He uninstalled an app he had recently installed, which was apparently causing a conflict, and it cleared up the problem for him. So I set the status to fixed - by him for his computer. Not by me. I don't have any idea what I would do to accommodate rare Firefox problems. Gopher has been played 2,470 times on BGA, undoubtedly including many Firefox users, and only two of them, including you, had this issue. The other guy fixed it in his own Not to finger point, but it seems to be an issue with Firefox conflicting with other apps on the same computer. Let me know what you find out. Thanks.

Please try disabling your extensions and plug-ins.

Gopher has been played thousands of times with only a tiny percentage of Firefox users having a problem. The vast majority of Firefox users, and all other browser users haven't had any issues. There’s nothing sinister about the Gopher program. It’s just a copy of the Reversi program with the board and game logic swapped out. Try disabling extensions and add-ons. Let me know how it works out. Thanks.

"I see this bug is occurring to other Firefox users."

That should be a clue.

Try deleting unnecessary add-ons, updating to the latest version, or better yet...

(Switch to another browser. Any browser.)