Bugzilla

(In reply to Dana Keeler [:keeler] (use needinfo?) from comment #19)
> How do I make Firefox speculatively connect in this way? I'm running a
> server that requires a client cert, I have a client cert installed, etc.,
> but I can't get the client cert selection dialog to come up without actually
> visiting the server with a normal navigation (I'm on linux by the way).

I know about the only way: make a page on a different origin (likely file:/// will do too) that has a link to what ever page on your client-cert-requiring server.  Then click-and-hold the link.  That will trigger an ssl preconnect.  On release we deploy the actual request.  Then it depends if the preconnected socket or a new one is used.