I'm very sorry to hear about this. So if I understand you correctly, every app except for the Web Browser app has returned to the Apps pane. Is that correct?
If so, could you open up the Apps pane and go to the bottom and select More Apps. That'll open up additional apps that you are installed but not listed on the Apps pane. It may be that the Web Browser is in there. It'll look like this when you're in there: http://support-us.samsung.com/cyber/popup/iframe/pop_troubleshooting_fr.jsp?idx=426479&modelname=UN46F5500AF&modelcode=UN46F5500AFXZA
I recently bought this tv and everything worked fine then the firmware was updated to version 1105. After the update all my smart hub apps were still there but if you clicked on any of them smart hub would shut down and return to regular tv. After four online chat sessions with Samsung and two smart hub reset and a tv factory reset i now have know apps on smart hub and the only left is the web browser icon. Anyone have any ideas on what i can do?