You might be interested in bug 32646
http://bugzilla.mozilla.org/show_bug.cgi?id=32646
christian wrote:
> Hi All.
> I've been trying to figure out a good way to get a thumbnail of a
> page, more generally, for any URL. Essentially i want to be able to
> create an icon (64x64 or less) of that URL to use in a GUI History
> project i'm working on.
> What options do i have?
>
> Looking through the source (i'm still learning the details), i thought
> i could grab the pixels from an nsDrawingSurface/nsRenderingContext
> but haven't tried it yet. I thought i might also just create a new
> implementation of this interface, something like nsDrawingSurfacePNG
> which would pretend that PNG was another surface along with Windows
> and GTK. It seems to me that this latter solution would cause a page
> to get rendered twice, and might be too much for a simple thumbnail?
>
> Any ideas or direction to a suitable implementation would be very
> appreciated.
>
> thanks,
> christian.
>
>
