Are you letting the browser update itself, or from a pop-up? Look on your desktop. Do you see a folder called; '''Old Firefox?''' Look inside. Look for the folder with the latest creation date. https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

https://support&#46;mozilla&#46;org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible http://kb&#46;mozillazine&#46;org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder https://support&#46;mozilla&#46;org/en-US/kb/profile-manager-create-and-remove-firefox-profiles https://support&#46;mozilla&#46;org/en-US/kb/back-and-restore-information-firefox-profiles Type '''about:profiles'''<enter> in the address bar&#46; How many profiles are listed? How many should be there? Also, open the profile folder in your file explorer&#46;

Let’s do a full clean re-install; Note: Firefox comes in three or more folders on all computers&#46; They are; Maintenance: (Programs Folder) <Windows Only> Firefox itself: (Programs Folder) And two folders in the profile of each user on the computer for each Firefox profile for that user&#46; If you remove the Firefox folder, the user profiles would not be affected&#46; ----------- [http://www&#46;mozilla&#46;org/en-US/firefox/all/ Download Firefox For All languages And Systems] {web link} [https://www.mozilla.org/en-US/firefox/organizations/ Firefox ESR; Extended Support Release] {web link} Beta, Developer, Nightly versions https://www.mozilla.org/en-US/firefox/channel/desktop/ [https://support.mozilla.org/en-US/kb/install-older-version-of-firefox?cache=no Install Older Version Of Firefox] {web link} Save the file&#46; Then '''Close Firefox&#46; ''' Using your file browser, open the '''Programs Folder''' on your computer&#46; '''Windows: ''' C:\Program Files C:\Program Files (x86) '''Note:''' Check Both Folders '''Mac: ''' Open the ''' "Applications" ''' folder&#46; https://support&#46;mozilla&#46;org/en-US/kb/how-download-and-install-firefox-mac '''Linux: ''' Check your user manual&#46; If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it&#46; See Install Firefox on Linux; https://support&#46;mozilla&#46;org/en-US/kb/install-firefox-linux If you downloaded and installed the binary package from the Firefox download page, simply remove the folder Firefox in your home directory&#46; http://www&#46;mozilla&#46;org/firefox#desktop ++++++++++++++++++++++++++++ Look for, and remove any '''Mozilla''' or '''Firefox''' program folders&#46; Do not remove the '''Mozilla Thunderbird''' folder if there is one&#46; '''Do Not''' remove any profile folders&#46; After rebooting the computer, run a registry scanner if you have one&#46; Then run the installer&#46; +++++++++++++++++++++++++++ If there is a problem, start your '''Computer''' in safe mode and try again&#46; [http://encyclopedia2&#46;thefreedictionary&#46;com/Linux+Safe+Mode How to Start all Computers in Safe Mode;] {web link} Free Online Encyclopedia