Clicking a link just displays an empty page while changing the URL. It looks like the "ui-page-active" class is not properly set. Refreshing the page properly displays it.
To reproduce simply open the demo pages of JQM 1.1.0 or 1.1.1 and click on "Pages & Dialogs". The same works on JQM 1.0.0 and 1.0.1.
I know Firefox 4 is very old, but the documentation still says that it's supported.
References regarding this issues can also be found here:
Can you confirm that it works if you set transitions to "none"?
@uGoMobi Yes, you're right. Disabling page transitions helps.
Thanks for reporting back. It is a regression that came with the transitions revamp for 1.1. Will try to find out what exactly is causing the problem.
Closing this ticket because we no longer support Firefox 4 as A-grade. See also ticket #5953.