Hello dunnes2P+S, if you have problem with update firefox the better way is to '''download and install the new version'''. 1. Download a copy of the latest firefox from http://www.mozilla.org/en-US/firefox/all.html 2. '''Trash''' the current Firefox application to do a clean install. 3. Install the version that you have downloaded. Do not select to remove your personal data, your profile data is stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox#Mac Firefox Profile Folder], so you won't lose your bookmarks or other personal data. see also: [https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac?redirectlocale=en-US&redirectslug=install-firefox-mac#os=mac&browser=fx24 Installing Firefox on Mac] https://support.mozilla.org/kb/learn-more-about-the-design-of-new-firefox thank you