Somehow in the past few weeks, lots of sites have started repeating the same article and the same incorrect information that WebSearch+ from Brand Thunder is malware. This is patently false. WebSearch+ is simply the method Brand Thunder uses to monetize its add-ons and it is 100% configurable by the user. Every feature can simply be turned off in preferences.
Brand Thunder put up a post with more information – What is WebSearch+
Hopefully that will clear things up.