Yelp forms an anti Google coalition

Interestingly I downloaded and installed the chrome extension over the weekend, only to get a message in my browser that Google had disabled it as it was deemed to be unsafe 

So is this big brother or maybe round one of clash of the Titans? 

This isn't the first anti Google coalition, with Trip Advisor, Microsoft and Expedia amongst others forming the FairSearch alliance who regularly put pressure on Google.

With recent EU antitrust activity and German Newspapers unhappy with Google displaying paid content, is there an anti Google backlash starting to grow, or is this just sour grapes from smaller competitors?