Mozilla released Firefox 4 Beta 10. According to a post in Mozilla.dev.planing google Group, Firefox Beta11 is expected before the end of this month (Probably the 31th of this month), while the final release will come before the end of February.
This is a widget panel. To remove this text, login to your WordPress admin panel and go to Appearance >> Widgets, and drag & drop a widget into this widget panel. If you want to leave this area blank, simply put a blank Text widget into this widget panel which will overwrite this text.