This easy to follow guide will show you how to block the sites (domains) that you don’t want included in your Google search results.
The only caveat is that you have to be using either Google Chrome or Mozilla Firefox – I’m not sure this can be done in Safari or IE/Edge (if you know how please let us know in the comments!)
The screenshots used in this guide are from Chrome – the steps are nearly identical if you’re using Firefox, and you won’t have any trouble following along.
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It doesn't work. Note that the extension is not updated since 2015.
It would be great if it still worked, but Personal Blocklist for Firefox does not work right now, as the developer himself admits.