How do I debug a mobile Safari crash that works on iPhone 5, but not 4S

Question

I'm not even sure where to begin. Page loads fine on my 5, but not my 4S. Instead it crashes the browser to the home screen.

Without sharing the specific URL, can you point me in the right direction to debug this?

There are no discernible errors in Firebug or other debugging tools on my computer.

Answer 1

You should be seeing a crash report in Xcode organizer and an exception on the command line. Since this is an Apple app you should report this as a Radar.

Answer 2

Does your 5 have a newer version of safari?

Use the iOS simulator if you have it, and then try running with different versions of safari, you can get a log output from it, especially if you are using dashcode, otherwise I think it is in the system logger. That is, if you have a Mac.