Clicking the link results in no response. The links appear to be active.
I've had a chance to do some testing. If I create a new simple form with one hyperlink, make the form "Restricted" and publish it to a shared location, users that have FireFox can open the form and the link works. If I let the form select the security level or set it to "Domain", the FireFox user cannot view the link. Curiously, IE launches to display the file and not FireFox.