Simple way to block any site you want
The Site Blocker provide simple and easiest way to block any web site you want. After installation it add option in context menu, so you can easiest block(or unblock) web sites by right clicking on page. You can add site or sites list in options page and they will blocked automatically. All blocked sites has 'Password protection' option.
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To block sites in incognito mode you need to activate 'Allow run in incognito mode' checkbox in chrome://extensions page.