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In game, cards I am drawing are normal, but when I open the main deck or extra deck, the cards are mirrored on the y-axis (text reversed, levels on opposite side, art mirrored), and when I move cards out of the main or extra deck while searching to the field, hand, or gy, the cards remain mirrored like this
The issue is not occurring on Chrome but is occurring on Firefox

Having the exact same issue.

Also have the same issue. I do not have this issue on my Macbook Firefox, but it is happening on my Windows 10 Firefox.

I'm glad to see this issue isn't just me. I've tried clearing cookies and temp files/cache but the issue still remained. I've tested with another account and it still remained. And I can also attest it's solely a Firefox issue and not with other browsers.