I've had this problem before, but now it's happening again and, it doesn't want to stop, it's disturbing a lot to make the skins.

Simply the Undo and Redo button doesn't work right, I need to reload the page to work again, after painting several pixels, it stops working, and when I reload the page, the Undo works again, but not correctly, it makes theUndo of much older pixels.

And then I have a big tremor in my hand, and when I'm doing the pixels, I suddenly shake my hand, and I paint a lot of pixels wrong, and I can't undo those pixels wrong, and I have to do it all over again.

Fates

Mozilla Firefox

Windows 10