Note : Before doing any step, please check your Mac is updated or Not.

Step 1 : Close all Open Applications
  • Navigate to Apple Icon from Top Left Corner and then click on Force Quit.
  • After that Force Quit all the open Applications except Finder.
Step 2 : Open ~/Library
  • Now, Click Go Select Go to folder Type: ~/Library. Then Hit Enter
  • Look for Cookies, Cache and Safari. Select them all and Move to Trash.
  • Navigate to Folder Saved Application State.
  • Search for com.apple.Safari.savedState and Move to Trash.
  • Then Close the window.
Step 3 : Open Terminal
  • Now, Open Terminal.
  • Copy and Paste all these commands at once in Terminal.
 mv ~/Library/Safari ~/Desktop/Safari-`date +%Y%m%d%H%M%S`; \
 rm -Rf ~/Library/Caches/Apple\ -\ Safari\ -\ Safari\ Extensions\ Gallery; \
 rm -Rf ~/Library/Caches/Metadata/Safari; \
 rm -Rf ~/Library/Caches/com.apple.Safari; \
 rm -Rf ~/Library/Caches/com.apple.WebKit.PluginProcess; \
 rm -Rf ~/Library/Cookies/Cookies.binarycookies; \
 rm -Rf ~/Library/Preferences/Apple\ -\ Safari\ -\ Safari\ Extensions\ Gallery; \
 rm -Rf ~/Library/Preferences/com.apple.Safari.LSSharedFileList.plist; \
 rm -Rf ~/Library/Preferences/com.apple.Safari.RSS.plist; \
 rm -Rf ~/Library/Preferences/com.apple.Safari.plist; \
 rm -Rf ~/Library/Preferences/com.apple.WebFoundation.plist; \
 rm -Rf ~/Library/Preferences/com.apple.WebKit.PluginHost.plist; \
 rm -Rf ~/Library/Preferences/com.apple.WebKit.PluginProcess.plist; \
 rm -Rf ~/Library/PubSub/Database; \
 rm -Rf ~/Library/Saved\ Application\ State/com.apple.Safari.savedState
These commands will fully wipe out all of your old Safari settings.
Restart the Mac and Open Safari again.
Smile ("_")