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I can't use touchpad scrolling in webpage tabs when a PDF tab is open in Firefox 4

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When using Firefox 4, if I have a PDF open in a tab (using the Adobe Reader 9 plugin, whatever the latest update was), I can't use my touchpad scroll in other tabs until I close the PDF tab. I can scroll fine in the PDF tab. This is on a HP laptop, the touchpad is made by Synaptics. Did not notice this problem in Firefox 3.6.

When using Firefox 4, if I have a PDF open in a tab (using the Adobe Reader 9 plugin, whatever the latest update was), I can't use my touchpad scroll in other tabs until I close the PDF tab. I can scroll fine in the PDF tab. This is on a HP laptop, the touchpad is made by Synaptics. Did not notice this problem in Firefox 3.6.

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I have this problem and have found a bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=626813

If you have this problem, please comment on the bug with your OS version (Windows 7 64-bit, for example, or Windows XP, 32-bit) and who makes your touchpad (Device Manager -> Mice -> "Touchpad Maker" Touchpad).