thx, I understand about extensions, but this malware causes random words to be double-underlined. Mousing over them opens a box advertising a website. One website is "InternetCorkboard".
Example: the randomly-underlined phrase is [Boy] "Scouts of America." The WebConnect pop-up box says, "What you need to know about "scouts of America," referencing the "InternetCorkboard" site. However, on the second mouse-over it advertises a different website, "StLuciaNow.com." Other underlined words bring up such sites as "ModernSchooling.com."
I have AdBlock Plus and have applied Spybot, to no effect.