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I look forward to dealing with this on shady sites that want to disable the back button.

This was possible without the advent of HTML5. One could always change the hash frag to your hearts content or use hidden iframes

Yup. It's kinda shocking that there doesn't appear to be some limit on the number of history entries you can push, in Firefox at least.

chrome as well. i imagine it will be dealt with.

and/or a rate limiter