Anchor-linked footnotes always disrupt your page position and consequently your flow when reading. Footnotify is a Browser Extension to display footnotes as a pop-over. All that without upsetting your point of reference. 1 ← Go ahead, click the footnote!
Safari: Download the extension bundle. Double click the the downloaded file to install to Safari.
Appreciate the idea? Follow @hpeikemo for more inspiration and ideas.
Update: Johan (@kottkrig) created a Firefox port.