iReader extension is like Safari Reader for Google Chrome and Firefox
If you like the look of Safari Reader but would rather not change from Google Chrome or Firefox, don't worry. The iReader extension brings the same functionality to your browser of choice!
Like Safari Reader, iReader shrouds the background in semi-opaque blackness . Hover near the bottom of the page to display zoom and print controls, as well as e-mail/Twitter/Facebook sharing buttons. iReader is also highly configurable -- set Gmail as your 'send page' client, change the display font, activate smooth scrolling, set the "curtain" to be more or less transparent, and adjust the reading area and margins. You can also choose hotkey combination to activate iReader (rather than having to click on the Omnibar icon).
Download iReader : Google Chrome extension or Firefox add-on