Posted Mar 12, 2008 19:22 UTC (Wed) by i3839 (guest, #31386)
[Link]
Because otherwise they can't be displayed. As for caching:
> In Firefox 3, thanks to some work by Federico Mena-Quintero (of GNOME
> fame), we now throw away the uncompressed data after it hasnt been used
> for a short while.
This change is so much more important than that animation thing quoted.