Exclude W3Schools: (in Google Search)

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Slightly different than other 'hide W3Schools' extensions, you will always get ten results, none of them will be from w3schools.com.Get rid of incorrect, incomplete and misleading W3Schools.com search results.

There are some other extensions out there that just HIDE W3Schools.com search results. The problem is that you end up with less results. This extension will monitor for W3Schools.com search results in Google, and when it sees one it will REDO your search with an added "-site:w3schools.com" search modifier. This tells Google to exclude the site, resulting in 10 good search results.