safari continually shuts down

You may  have adware/malware installed. Try downloading this program which was written by Thomas R, a long time poster. The program will search for malware/adware The program will do the work for you which makes it easy. It may be necessary to run more than one scan. After running the scans, restart the computer.

Malwarebytes Anti-Malware for Mac      10.10 and later

Malwarebytes uninstall

Try setting up another admin user account to see if the same problem continues. Please post back on whether or not this worked. Also try the Safe Mode. Please post back on whether or not this worked.

Isolating an issue by using another user account 

Safe Mode - About

If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor.  Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown. If the log won’t post, try posting it in Pastebin and provide a link in a reply        Pastebin

Etrecheck – System Information

Go step by step and test

   1.Restart your Router.

      Startup in Safe Mode.

      Launch Safari to test.

      Restart normally by clicking the “Restart” button at the bottom.

      Start up in Safe Mode. https://support.apple.com/en-us/HT201262

   2. Launch Safari holding the shift key down and test.

   3.Check for adware. 

      Use  the latest release of Malwarebytes for Mac to remove malware/adware, if installed on your Mac.

      For instructions:  Install Malwarebytes for Mac          Uninstall Malwarebytes for Mac

      Click the “Scan Now” button. Once done, quit Malwarebytes for Mac.

      Restart the computer and relaunch Safari holding the shift key down.

  4. If the steps posted above don’t help:

      Download EtreCheck: https://etrecheck.com/maspro  and post the report here.

      Click, “Free Download” button and then  “Click to download” button.

      Open Downloads folder, click on it to open, and then select ”Open”.

      Click on the bouncing  EtreCheck icon in the Dock.

      “Choose a problem” from the popup menu box, and then “Start EtreCheck” in the dialog.

      Click “Share Report” button in the toolbar, select “Copy report” .

      Paste the report when you reply.