The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.
Tab Badge add a small badge to your tabs to alert you to (for example) new messages on Facebook. The badge is also visible when the tabs are pinned so you can see when there's something new available. The badge is based on the title of the page, so if it is "(8) Twitter or Home", a red badge with the number 8 is displayed inside the tab. You can blacklist the badge from any website by right-clicking on it (and as of version 1.2, remove badges from the blacklist).