Safari is not open anymore.

1. Click  in the menu bar and choose “Force Quit”

     or press command +option + esc keys on the keyboard together.

    In the window that opens up, select “Safari”  and click “Force Quit.

2. Relaunch Safari holding the shift key down.

3. If this doesn’t help, use  Malwarebytes for Mac to remove malware.

     https://www.malwarebytes.org/antimalware/mac/

   Download, install , open,  and run it by clicking “Scan” button   to remove adware.

   Once done, quit Malwarebytes Anti-Malware for Mac.

     Install guide:       https://support.malwarebytes.com/docs/DOC-1817

     Uninstall Guide:  https://support.malwarebytes.com/docs/DOC-1190

    The installer may ask you to allow it in System Preferences > Security & Privacy. Allow it.

   Reselect your search engine, reset homepage and disable all extensions and test.

   Reset search engine:    https://support.apple.com/guide/safari/customize-your-search-ibrwe75c2a3c/mac

   Set your Home Page.   https://support.apple.com/guide/safari/set-your-homepage-ibrw1020/mac

Disable or uninstall extensions:

    Section: Manage extensions: https://support.apple.com/guide/safari/use-safari-extensions-sfri32508/mac

Fitz1319,

Shutting the Macbook off, via the power button, worked! Most importantly, it enabled access to a fresh Safari browser - so that I could download: Firefox, Chrome & Malwarebytes. Running Malware, cleared up the original problem. Thanks!

That is a problem.

Can you try Safe Mode?

If third party application is blocking Safari from launching, a user can download it in Safe Mode.

Startup in Safe Mode and try launching Safari.

Enter this address manually if you have to.

https:https://support.apple.com/en-us/HT201262

Do you have another Administrative account setup?

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

If Safari does not launch, and we have no other mac browser, how does one download malwarebytes - to fix the problem?