beta warning reappears repeatedly

seen in Firefox on any page at http://en.wikipedia.beta.wmflabs.org/

As a logged in user, dismiss the beta warning if it occurs.

Click rapidly between Editbeta tab and Edit source tab without entering text.

Beta warning will reappear.

Note: this was an attempt to repro the badtoken/logout bug seen in automated tests Bug 65709

Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=65709

Attached: