joindin/joind.in — pull request #543 by akrabat (2012-10-25 05:17:37+00:00)
Title: Rework the CSRF checks to use a stack of tokens

This PR changes the single CSRF token to be a stack of tokens so that a user can have multiple tabs open and submit a form on each tab. And, of course, using a form after using the back button also works!