Southern writes:  

I found myself staring at the “about:blank” parameter for an IE installation today, and that got me thinking if it works in other browsers too. It did. I’m using Firefox, and that cleared the address bar to a blank. And then I figured the developers HAD to include some more address bar commands and started looking them up. Here’s what I found:

about: A simple prompt without any parameter will display the Mozilla “about” information. Since it’s accessible from the top menus as well, it’s not quite a hidden feature.

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