[Accessibility-ia2] IA2_STATE_PINNED

[David Bolter]

In Firefox 4 betas you can pin browser tabs. This means that the tab 
will become a permanent tab that is visually distinct and appears 
together with other pinned tabs to the left of the regular tabs. We have 
a patch to expose a pinned object attribute for tabs that are pinned but 
are pausing to consider whether this is the right long term fix.

So, create an IA2_STATE_PINNED or expose an object attribute?

Cheers,
David