It does kind of work, but you have to drag further until something happens. If you grab the vertical scrollbar and move it to the bottom, nothing happens at first. But as you drag further to the bottom, the page starts scrolling. By the way, I use this in Firefox's error console: top.window.opener.getBrowser().markupDocumentViewer.fullZoom = 2;
Created attachment 274065 [details] [diff] [review] Patch I'm not sure where exactly that math was messing up, but I don't really care.
Please don't add checkin-needed to my bugs... the reason I haven't checked this in is that the tree is closed.
Comment on attachment 274065 [details] [diff] [review] Patch Patch makes scrollbars use standard utility method to calculate coordinates; unlikely to cause regressions.
Comment on attachment 274065 [details] [diff] [review] Patch a19=dbaron