[gcp]

Firefox has an infamous open bug about adding it in dating back to 2000: https://bugzilla.mozilla.org/show_bug.cgi?id=36351 - over 11 years! Despite what it looks like in the last comment, my Firefox 8 still does not have support.

The bug was WONTFIX-ed more than 2 year ago, so it will probably never support it.

As I see it Firefox, Opera and Safari will all need to support this first, before web designers in general will even consider using it.

...and this was the reason for the WONTFIX: https://bugzilla.mozilla.org/show_bug.cgi?id=36351#c98

I sense some chicken and egg problems here. I'm guessing neither side though the improvements compared to complexity of adding support are worth it. I'm not sure WebP changes the equation.