NoScript is the only protection here!

[polonus]

Hi malware fighters,

If you take a test for Browser Security Tests: Failed JavaScript On-Unload Test

The webpage was able to redirect you to another page. This means that a website will be able to trap you on a page, or constantly re-open pop-up windows that you have closed. Unfortunately, there is no way of preventing this short of disabling JavaScript entirely. Well that is what you can do with NoScript extension installed and active,

polonus

[FreewheelinFrank]

Here's a good page to test that:

hxxp://techsmartly(dot)net/freePS3(dot)php

Don't go there with Firefox naked unless you know how to kill the browser with Task Manager/System Monitor!!

Firefox is trapped- Opera is not bothered.

The page is harmless if you want to try.