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Every time I restart macOS (v10.12.4) on Mac Mini Firefox opens. I don't even use Firefox routinely, however, occasionally I need it when old fashioned website doesn't work with Safari — boy, is it slow by comparison! I looked and relooked at preferences to see where to shut it off to no avail. What might I do to get it to stop. Thanks.
Mac mini, macOS Sierra (10.12.4)
Great, I just wanted to be clear that it looked like bad/ malicious software was causing the issue. Post back if you can't get Malwarebytes to run. You probably don't want it installed.
Stop Firefox from opening at restart
