I agree with the previous posts.
1. Scan your computer for malware, using a different program than your usual. The free malwarebytes from cnet.com or malwarebytes.com http://download.cnet.com/Malwarebytes/3000-8022_4-10804572.html or https://www.malwarebytes.com// (make sure you only download that one program, not the optional bloat) will tell you if you have something directing extra ads to you. Make sure you’re clean first! No skill required.
2. Download at least free adblockplus https://adblockplus.org/ with the pro version if you find it useful. No skill required.
3. Consider ghostery, https://www.ghostery.com/ although that may require a little more thought on the settings.
Even Breitbart http://www.breitbart.com/ is clean with the first two in place. No one should browse without a decent antivirus (and Malwarebytes is both decent and free) and an adblocker.
Bookmark for reference. I can’t even read Breitbart without it crashing my browser.
bfl