User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b12pre) Gecko/20110216 Firefox/4.0b12pre Build Identifier: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b12pre) Gecko/20110216 Firefox/4.0b12pre In Firefox 3.6, when page sends a javascript alert, firefox icon in window taskbar would blink to warn user that page says something. But in Firefox 4.0 nightlies, after tab-modal prompts change, firefox icon in Windows taskbar does not blink anymore. So when there is message from page, it's always being missed if the windows that includes page is minimized. Reproducible: Always

This is deliberate, we're making alert prompts less OS-native by making them unable to do things a web page otherwise couldn't do. Specifically, I didn't port over the "window.getAttention();" call that does this.