The ScanLife add-on for FireFox lets you create and download a 2D barcode of the current page or any selected link, image, text selection or input field value. Barcode formats includes EZcode, QR Code and Data Matrix. To create a barcode of the current page, click on the 'Add to ScanLife' button on the toolbar. To create a barcode of any link, image, selected text or input field value, right-click on the item of your choice and select 'add to ScanLife.'
Optionally you can sign up for a free ScanLife account on http://www.scanlife.com and manage all your codes in one place. In addition, your ScanLife account lets you create other types of codes like Tweets, contacts, calendar and many more.