Beware: I also have a User Agent Switcher extension installed and was surprised to hear about this malware. Looks like the one I've been using safely is called "User-Agent Switcher" (https://chrome.google.com/webstore/detail/user-agent-switche...) and is only 23KB (whereas the "... for Google Chrome" is at 350KB).
"lkmofgnohbedopheiphabfhfjgkhfcgf" is the identifier for the user-agent extension I've been using for a while, and looking at the code, it's very straightforward and not spying on anything. It has not been updated since 2013 (and the website listed for the dev, www.toolshack.com, is not online), so I'm guessing a lot of users just go with other extensions that have received updates.
