Hi,
Chrome Browser Actions provide a really nice popup effect by default.

- Hovering over the toolbar icon provides a neat hover effect. 
- Clicking the toolbar icon shows a nice animation that opens the popup html file. 
- The popup is aligned with the button that is pressed. 
- Clicking the toolbar icon again fades out the popup. 
Any thoughts on how to approximate this effect with Firefox extensions? Has anybody successfully achieved something similar to this effect?
Thanks.