uBlacklist for Chrome and Firefox removes specific sites from showing up in Google search.
uBlacklist allows you to add rules on search result pages and sites to be blocked by clicking the toolbar icon. Rules can be specified either by match patterns (i.e. *://*.example.com/*) or by regular expressions (i.e. /example\.(net|org)/). Adding a site is really simple, but keep in mind that it is address-specific to show other related topics. You also can sync blacklists between your devices via Google Drive and subscribe to public blacklists.
uBlacklist will be a handy browser tool for those who would like to eliminate certain results allowing you to hone in other topics rather than the standard top 10, making it a great way to perform research. It can also help keep away from certain time-wasting results.