Until now, proper footnotes have required bookmarklets or scripts embedded on individual pages. But with this new extension; beautiful footnotes are automatically enabled on any page where the footnote-markup is parseable.
Try before you install1 ← Go ahead, click the footnote!
This early release is not thoroughly optimized. It’s not much worse than anything else out there but I would like to find a way to defer loading of jQuery and more until actual footnotes are detected on a page. Presently I have not found a way to conditionally inject scripts.
Find bugs? Let me know. If you’d like to port this extension to other browsers. Just do that; more details in this post.