Swap the names of races in the current page. If it sounds racist one way, it's racist the other way.
There's an easy way to tell whether an assertion in a news article or blog post you're reading is racist: swap the races. If it sounds bad that way, it's bad the first way.
Just click the icon to swap words like "white" to "black" and vice versa on the web page you're currently viewing. The extension doesn't have access to anything other than the current tab, and doesn't collect any data.