- h : scroll left
- j : scroll down
- k : scroll up
- l : scroll right
- g : go to the top of the page
- G (shift-g) : go to the bottom of the page
- Originally by the author of this O'Reilly post
- Packaged by Arno, a commenter there
- Updated and repackaged by me on AMO
- Documented by Christopher Svec
- Rewritten from scratch with the WebExtensions API for Firefox 53 and after (and a few before) by me