Why does not the scan catch this adware? macsmart-optimize.club

[RobertoPisa]

I have the latest version of Mac OS X and Malwarebytes (trial version), and I get adware from macsmart-optimize.club 

I ran a scan, as shown in the picture, and it says it is clean. But I have the adware as it can be seen... 

Thanks

Roberto

[alvarnell]

It’s not adware. There is nothing on your computer that is causing this. It’s called “Malvertising” and it comes from JavaScript embedded in an advertisement on the site you were on at the time that message and popup appeared. The only way to avoid such things is to use a good adblocker. Malwarebytes has a new one for Chrome and Firefox (but not Safari yet) described here.

[Massimiliano]

For Safari, at the moment, you can download from the Mac AppStore Ka-Block!  

It's completely free, has no privileges and the whitelist can be created from Safari Preferences-> Web Sites-> Content Block

I have been using it for years and I am fine.  
 

NB    It's just an Ad-Blocker;  it has no other functions.