I am facing a tab container issue on the form (cannot do word wrap). I saw

Can you attach a screenshot of the behavior?

...comparing IE vs Firefox?

Screenshot Attached

1. It works for me on both browser. See attached screenshot and example.
2. I suggest you test with the attached example to see if this is an issue with your browser or your browser cache or with your model
3. Notice how you don't specify any custom CSS class in the tabbed container, you simply add that CSS to the custom CSS library, nothing has to be done in the form itself.

Tabbed Form Multiline.zip

Please kindly find the problem in firefox from the attached files.

Tabbed Form Multiline ON Firefox.gif

Tabbed Form Multiline ON IE.gif

Oh I see, the problem is actually when you click, not when you open the form itself. I see the same behavior.

What version of Appian are you on? So I can test there and see if I find a better workaround

Appian 6.7.1