This is an extension that adds two new context menu items to the right-click menu. One of the features is the Remove Formatting option, which can be used to remove the HTML formatting from the selected text. The other one is the Copy Plain Text option, which can be used to copy the plain text version of the selection to the user clipboard.

So, what does it do?

This extension is used by many people, especially developers, to get rid of the annoying HTML formatting displayed on a web page. This is especially useful when you're using a WYSIWYG HTML editor.