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Re:JS Paint – A web-based MS Paint remake by needz on Thursday January 18, 2018 @03:12PM (#16180885)
I don't understand why it needs to hijack the back button.
Re:JS Paint – A web-based MS Paint remake by 1j01 on Thursday January 18, 2018 @09:15PM (#16183598)
It changes the URL to store the image in a specific session, so if you close the tab by accident you can reopen it from history (or ctrl+shift+t in some browsers)

I've opened an issue for it now here: https://github.com/1j01/jspaint/issues/49