[Project_owners] icon animation

[Eric H. Jung]

Hi,

I'd like to animate an icon in my extension while it is "active"; i.e., doing something, similar to how the browser throbber is animated while a web page loads. My first thought is to replicate what Firefox does with its throbber: alternate between an animated gif (chrome://global/skin/throbber/Throbber-small.gif) or a static png (chrome://browser/skin/Throbber-small.png). Is there a more efficient way?

Thanks for any ideas, 
Eric