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Do you want to set Gmail to load automatically when you open Safari ? If so, do the steps below;
You can change it back to Gmail. Open Safari. In Safari, click on Safari menu at the top left next to Apple menu. Click on Preferences. Click General tab and under General tab, change the home page to www.gmail.com
Close the window. Restart Safari.
This will open your Gmail from now on when you open Safari. Please let me know if that didn't work, so I will continue to help you.