Speedomizer is a search hijacker. Malwarebytes can detect and remove this potentially unwanted program. This particular one was downloaded from their website after a redirect. It would have blocked the site that installed the extension. You may have to remove the Chrome Extension manually under Tools > More Tools > Extensions. The full version of Malwarebyte would have protected you against this hijacker, but not the full version would have done so, it would have prevented the hijacker from getting on your computer.”]
Source: https://forums.malwarebytes.com/topic/214129-removal-instructions-for-speedomizer/