Want to highlight a helpful answer? Upvote!
Did someone help you, or did an answer or User Tip resolve your issue? Upvote by selecting the upvote arrow. Your feedback helps others! Learn more about when to upvote >
Did someone help you, or did an answer or User Tip resolve your issue? Upvote by selecting the upvote arrow. Your feedback helps others! Learn more about when to upvote >
iMac, OS X Yosemite (10.10.2)
Start up in Safe Mode. https://support.apple.com/kb/PH18760?locale=en_US
If that doesn't help:
Safari > Preferences > Extensions
Turn those off and relaunch Safari.
Turn those on one by one and test.
Why is there a black square in the corners of Safari
