how can I download german version

You may obtain it from here * http://www.mozilla.org/en-US/firefox/all/ ** currently https://download.mozilla.org/?product=firefox-27.0.1-SSL&os=win&lang=de Take care when installing. There is no need to delete the Firefox profile, or use any option to remove personal information. (If you do you will loose settings, bookmarks and passwords.) * It maybe worth you backing up your profile before reinstalling <br /> [[Back up and restore information in Firefox profiles]]