EndNote offers a couple ways to save references directly from your browser into EndNote Online or EndNote Desktop. One is through Capture, a downloadable extension for the Firefox browser, and the other is through the Capture Reference bookmarklet. The Download Installers link from the EndNote Online page gives full details.
The Capture Reference bookmarklet is available if you downloaded the Web Capture installer.
The Capture tools scan the bibliographic information presented on a Web page and create a reference that you can save to a new or existing group. If no group is specified, the reference is saved to Unfiled.
For the Capture buttons to work best, you must be in a Capture compatible resource and at the individual item level (not in a list of citations). List of Capture Compatible Sources