Comment 26 for bug 294712

> because what happens when I'm in tab A and right click to show this blocked
> image, while other tabs B and C are still loading

There's no problem in this scenario.

> Also, what about locked preferences in environments where the end-user can't
> change/add preferences?

This, on the other hand is a serious problem. I agree that the patch to this bug should address this use case.