https://www.dropbox.com/account/security
I had a bunch of old devices in that list and removing each one triggered a full page refresh, which took longer than normal thanks to the JS-driven single-page design of the dashboard. The removal request itself went over AJAX, so I guess someone figured it was easier to throw away the page state every click than to remove an element from the list's DOM. Made the whole thing much more tedious than it needed to be; a form with a series of checkboxes and a single "remove" button at the bottom would have done fine.