Yesterday, I posted more info on the Firefox IDN issue along with a couple of additional work arounds to address the issue of the state of the enableIDN flag not being properly changed, even though it shows as being false. I had originally included a link to an extension that has been written to disable IDN permanently, but on the two machines I tested it on, Firefox wouldn’t load properly once the machine was rebooted. For those who just want things to work, I’d recommend against using the extension.

Editing the compreg.dat file manually works, as does installing the nightly build of Firefox, which is the option I chose since I already had to re-install the app to fix the load problem.

For those wanting to experiment, the extenstion is available here: http://friedfish.homeip.net/extensions/no-idn.xpi.