Lotsa windows

I just had a weird occurrence… I was in gmail, clicked to archive a message, and it started to open a bunch of new windows with one certain address:

http://mail.google.com/mail/#..&remote_iframe_0@2&1&0&%7B%22s%22%3A%22resize_iframe%22%2C%22f%22%3A%22remote_iframe_0%22%2C%22c%22%3A0%2C%22a%22%3A%5B199%5D%2C%22t%22%3A%22r0rtgf-lsmnyy%22%7D

It got to about 20 or so before I managed to kill it with taskman.