User Agent: Mozilla/5.0 (Windows NT 10.0; rv:48.0) Gecko/20100101 Firefox/48.0 Build ID: 20160823121617 Steps to reproduce: display a long pdf document (datasheet with 70 pages). FF loads a few pages. When I scroll below the last page loaded, it starts loading the next set of pages. If I then scroll bacjk, it reloads the pages that I have already seen Expected results: if not on mobile connection, download the whole document so that I can scroll without additional waiting time (all other browsers do that). If I scroll back to a page already seen, it should be from cache and not downloaded again Tis would be a good feature on a mobile connection, but it is LAN via router
It appears with some PDF, not all, I think. Maybe rendering of pages not in the viewport is removed to release memory allocated for that.
Component: Untriaged → PDF Viewer
Summary: pdf does no preload unvisible pages, reloads on scrolling back → PDF Viewer does no preload unvisible pages, reloads on scrolling back
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