Lorem ipsum dolor sit amet and I don't remember the rest :)

Instructions
This only works in Firefox. All other browsers seem to work.

1. Select text on the page (such as the lorem ipsum). You'll notice the selection color works.
2. Click inside (focus) the rectangle. This is an editable div. You can type in it if you want.
3. Select text again. It will be grey instead of red.

This effect remains until the page is reloaded, or the page's focus is completely lost.

Reproduced in Firefox 17 under Linux and Windows.

Originally found by: PiJoKra