PDF.js already supports h/j (and p/n) keys to page up and down. (I added them ye...

cpeterso on Sept 23, 2020 | parent | context | favorite | on: Embedded PDF viewer in Firefox 81 supports filling...

PDF.js already supports h/j (and p/n) keys to page up and down. (I added them years ago. :) I think GP is asking for the keys to scroll the page by smaller steps instead of page up and down.