Sorry about that!
The extension had no permissions to work on the new chatgpt domain (chatgpt.com). I've just updated it and it may works now.
I recommend you to update the extension and try again. In case you find more issues, report it on my github repo https://github.com/Dpbm/gptmd.

Thanks for using it and, again, sorry for the inconvenience.

Good to see that you enjoyed, thanks for your review 😊