cool idea. quick q: why have a redirect for each quote? if it's for facilitating sharing, there may be better ways to do that without destroying back button functionality.
We thought that using pushState to allow user to press "back" button to get to previous quote would be a good feature. You're not the only one who doesn't like that, which means we're probably going to use replaceState instead and implement our own "previous quote" functionality.
Anyway, thank you for your feedback!