Sorry, your browser/program is not supported by Web Dynpro!

Yes, that's correct. Firefox 4 and Web Dynpro are currently incompatible with each other. You will have to wait until the developer updates their app to work with Firefox 4.

You can track what's happening on the SAP forums @ http://boardreader.com/thread/Problems_with_Web_Dynpro_and_Firefox_4_6rv33X159dx.html

This is a dublicate of https://support.mozilla.com/de/questions/790061 and together with https://support.mozilla.com/de/questions/786432 more than 1000 users are affected. Is it possible to put those tickets together???