When changing a build step from a Windows batch command to a Shell command the content of the shell command is not always saved.

Steps to reproduce:

1. Create two Windows batch command build steps.
2. Click Save
3. Click Configure
4. Delete one of the build steps
5. Create a Shell command build step and enter some text in it.
6. Move the just created build step to the top.
7. Click Save

What I expected to happen:
The content of the Shell command build step is saved.

What actually happens:
The content isn't saved.

I've tried the above method in both Firefox (with addons disabled), IE and Chrome and I've only successfully reproduced it in Firefox (is it a bug in Firefox?).