Created attachment 53609 [details]
Attached is a reduced testcase for a bug I noticed in the handling of multiple submit actions with _blank targets.
The code works on Firefox and Opera and opens several new windows for the programmatically triggered submit actions. I do not have the Popup blocker enabled.
See also: bug 28633. But that seemed to be Windows-only.
I have this bug with Version 4.0.5 (6531.22.7, r57720) to be exact.