Safari issues
Safari prevents quitting Safari and turning off computer-why? I am now using Chrome.
MacBook Air
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Can you Force Quit Safari (command - option/alt - esc)?
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