What is the name of the extension that can select a line of text by space?

Question

Browser extensions

In order to rewrite text from web pages into an abstract, I need an extension that will select a line of text in turn. Is it even possible?
Or in general will serve to the screen only on a line. Something like an application for quick reading, where one word changes quickly, only I need the line to change and not quickly, but on click. And then the lines are distracting, time is wasted searching.