The newest version of this virus was impossible to get rid of, so I reformmatted my hard drive. Luckily I had a back up from a month ago.
Not only was I getting underlined words, but I had a debilitating amount of pop ups. Even with a pop up blocker, it was clear it was working overtime and was just a band aid and still slowing down my computer and putting endless cookies in it, not a real solution to the problem.
I checked everywhere, extensions, extensions on browsers I don't use, the library folder, and I used secure deletion of files. I found files that were suspicious but even when I deleted them the problem persisted.
There is also a lot of misinformation about this virus. I highly doubt that you can just "opt out" without at least getting lots of background ******** on your computer still. I even paid for norton antivirus but it wouldn't detect it.
Save yourself the time and energy and just back up what you need and reformat the whole thing.