Need Help: how to remove this in Mac?

https://a3698060313.cdn.optimizely.com/client_storage/a3698060313.html Removed Chrome but didn't help. Keep happening in Safari. Is there any anti-virus software I should use? Downloaded TotalAV but still have it. Need help ASAP for my Mac. Detailed instruction please Thanks.

所有跟帖： 

• 是你要给MOre Detailed instruction please! -别在窗前等我- ♂ (519 bytes) () 11/21/2017 postreply 11:52:57

• 谢谢 -JustAsked- ♀ (0 bytes) () 11/21/2017 postreply 13:02:22