User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:2.0b9pre) Gecko/20101224 Firefox/4.0b9pre
Build Identifier: Mozilla/5.0 (Windows NT 6.1; rv:2.0b9pre) Gecko/20101224 Firefox/4.0b9pre
Popup windows usually don't require any tabs/toolbars therefore it would be better to use the latter.
See screenshots for example
Steps to Reproduce:
Created attachment 499744 [details]
This probably should block a tabs-on-top tracking bug, but I can't find one.