Comment 31 for bug 290867

(In reply to comment #15)
> a third option would be to keep throwing like we do now, and change all the
> consumers that set/test permissions to deal with the throw and do something
> sensible. (in the case of popup blocking - allow the popup? what does it do in
> similar failure cases now?)
>
> any thoughts?

So popups would always be allowed for local pages? That seems like a bad idea to me.
Why shouldn't nsIPermissionManager be able to deal with local file urls?
It seems to me that it at least should be documented in nsIPermissionManager.idl, that it doesn't handle file urls.