Make a selection. Click the button. Tune out the rest of the page
Reading Glasses lets you to read what you want to read and ignore the rest.
1. Make a selection of part of the page you'd like to read (you dont have to select all of the text)
2. Click the glasses
3. The rest of the page should become hardly visible.
4. When you're done reading, click the glasses to make the rest of the page visible again!
I set up a test url for once you have the extension installed (same as the screen shot)