Malwarebytes has determined that GamerSuperstar is adware. This particular one was installed by a gaming website, but it was also available in the webstore. The full version of the full version would have protected you against the adware. It would have blocked their domain. If you are using an older version, you may have to remove the Chrome extension manually under Tools > More Tools > Extensions. Click on the bin behind the gamerSuperstar entry and confirm Removein the prompt.”]
Source: https://forums.malwarebytes.com/topic/225378-removal-instructions-for-gamersuperstar/