Q: how to stop ads

1. Use  Malwarebytes Anti-Malware for Mac to remove adware

     https://www.malwarebytes.org/antimalware/mac/

   Download, install , open,  and run it by clicking “Scan for Adware” button   to remove adware.

   Once done, quit Malwarebytes Anti-Malware.

   or

   Remove the adware manually by following the “HowTo” from Apple.

   http://support.apple.com/en-us/HT203987

2. Disable Extensions and test.

    Safari 9

    Safari > Preferences > Extensions

    Disable all extensions and test.

    Enable Extensions one by one and test.

    To uninstall any extension, select it and click the “Uninstall” button.

3. Safari > Preferences >  Search > Search Engine :

     Deselect and select your preferred   search engine.

4. Safari > Preferences > General > Homepage:

     Set your Homepage.

Some you will not be able to stop.

Try Malwarebytes Anti-Malware for Mac:

https://www.malwarebytes.org/antimalware/mac/

It is free, fast and safe.  It is recommended and used by Apple telephone support and Apple genius bar technicians.

It may rid your MBP od many of them.

Ciao.

Click here and follow the instructions, or if there’s a type of adware not covered by them on the computer, these ones. If you'd rather not remove it manually, you can instead run MalwareBytes for Mac.

MalwareBytes is a removal tool and doesn't stop adware or other malware from getting onto the computer. It shouldn’t be relied on to prevent future incidents; instead, avoid downloading software from sources other than the Mac App Store or the developer websites.

(141579)

For more help:

https://support.malwarebytes.org/customer/portal/articles/2045704-what-should-i- do-if-malwarebytes-anti-malware-for-mac-didn-t-solve-my-problem-?b_id=9511

Click on the 'What to do if your problem was not solved' link and follow any instructions there.

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I have used Adblock plus for years and never had a problem. https://adblockplus.org/