Somehow, no doubt after installing some bit of software from a seedy part of the Internet, I ended up with ads being injected into my web browser as the pages rendered. You get this stuff all day on Windows, but not something I’d seen before on a Mac.
I looked for suspect extensions, and found none, but disabled them all any way.
The ads took the form of aggressive animated gif banners, plus highlighted words in text linking to advertisements, see above.
I tried searching the file system for suspect software, but didn’t find anything useful. I also tried searching the Internet, but while there is info for removing this from Windows, there is nothing for Mac that works.
I ended up watching the developer console in Chrome to see what connections the browser was requesting. The list I got that I reckon is suspect is below. I added it to Adblock plus and the ads are gone. If you know what software is the culprit, please post in the comments and I will update the post.
adnxs.com scorecardresearch.com dnsqa.me hklmm.com 2mdm.com cptlsrv.com