Is there a reason you are using an old version of Firefox? Let’s do a full clean re-install; [http://www.mozilla.org/en-US/firefox/all/ Download Firefox For All languages And Systems] {web link} Save the file. Then '''Close Firefox. ''' ------------------------ [https://support.mozilla.org/en-US/kb/install-older-version-of-firefox?cache=no Install Older Version Of Firefox] {web link} Be sure to read everything here. If you still want to downgrade, look under; '''I still want to downgrade. ''' Click the '''Directory of other versions and languages''' link. Look for the directory of the version that you want. But, remember that '''old versions may have security issues. ''' You should also check out [https://www.mozilla.org/en-US/firefox/organizations/ Firefox; Extended Support Release] {web link} [https://www.mozilla.org/en-US/firefox/organizations/notes/ ESR Notes] [https://www.mozilla.org/en-US/firefox/organizations/system-requirements/ System Requirements] Save the file. Then '''Close Firefox. ''' -------------------- Using your file browser, open the '''Programs Folder''' on your computer. '''Windows: ''' C:\Program Files C:\Program Files (x86) '''Mac: ''' Open the ''' "Applications" ''' folder. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac '''Linux: ''' Check your user manual. If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it. See Install Firefox on Linux; https://support.mozilla.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. http://www.mozilla.org/firefox#desktop ++++++++++++++++++++++++++++ Look for, and remove any '''Mozilla''' or '''Firefox''' program folders. Do not remove the '''Mozilla Thunderbird''' folder if there is one. '''Do Not''' remove any profile folders. After rebooting the computer, run a registry scanner if you have one. Then run the installer. +++++++++++++++++++++++++++ If there is a problem, start your '''Computer''' in safe mode and try again. http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode This shows how to Start all Computers in Safe Mode; Free Online Encyclopedia

This is a OS issue, not FF. Go to %AppData%\Microsoft\Windows\Recent\AutomaticDestinations and delete all files in that folder. Do the same for %AppData%\Microsoft\Windows\Recent\CustomDestinations, then reboot.

''Owlss [[#question-1231953|said]]'' <blockquote> The Firefox icon is fixed in the taskbar. When you call the context menu, there were items "New Window" "New Tab", etc. Now these items are gone. Tell me how can I get them back? </blockquote> Unless I misread your question - would you please try this : Type in the address bar '''about:config''' and press Enter (promise to be careful. if asked) Type in the search bar and look for the preference : '''browser.taskbar.lists.tasks.enabled''' And make sure its value is set to '''true''' Then close and restart Firefox (unless it was already set to "true")