PDFs don't allow scrolling in other tabs
For some odd reason, if a PDF is open in a Firefox tab, then other tabs do not scroll using a trackpad scroll mechanism (in this case, a sidebar scroll area). Using the scroll bar on the side of the window, they do scroll. This problem has been persistent since the 3.6 Beta 3 version.
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Can confirm that. Problem also still exists under Firefox 4.0 and is not related to the pdf viewer used.
https://bugzilla.mozilla.org/show_bug.cgi?id=622410 Vertical scrolling with trackpoint (Thinkpad, Synaptics drivers) still won't work
https://bugzilla.mozilla.org/show_bug.cgi?id=626813 laptop touchpad scrolling doesn't work on other pages/tabs while PDF file is open through browser plugin in any tab in the same window