Error
After I Finished The Game, Quizlet Gives An "Oops! Something Went Wrong." Error And I Dont Get A High Score. I Have Tried With 0.5s 1s 2s And The Default 5.1s In The Script.
I can't seem to replicate your problem, could you maybe provide more details so I can look into the issue further?
I Am In The UK And I Have Tried This On My Own Set To Check If It Works, I Have Tried With Both Firefox And Chrome.

Here Is Video Evidence If You Want It: https://youtu.be/KSd5BCr0zHU
Just try again. Alternatively, try shrinking the window size
I Just Tried With A Smaller Window Size, Still Never Worked.
To do this hack, you need to go to micro match and do it. This will save as the same score on normal match.