Comment 50 for bug 747197

Yes, I realize that. That's why we haven't implemented it. ;)

Serializing with a new base URI is nontrivial, since we only store absolute
URIs. We would need to duplicate some fun code that webbrowserpersist already
has. Further, for inline style there is no "sheet" -- there is just a
CSSDeclaration, and that implements no useful interfaces
(nsIDOMCSSStyleDeclaration/nsIDOMCSS2Properties are the closest it gets).

I suppose we could add another interface that you could QI these beasties to...
as long as we're careful, it should not be too expensive to do that...

Adam, I assume you're trying to fix this for 1.4?