Scrollbar does not work in PDF documents
When FF opens an PDF document the scrollbar does not work. If it is a one page document I can use Page up/Page down to toggle between top and bottom of page. If it is a multiple page document I can use PageUp/Page down and the arrow keys.
When FF opens an PDF document the scrollbar does not work. If it is a one page document I can use Page up/Page down to toggle between top and bottom of page. If it is a multiple page document I can use PageUp/Page down and the arrow keys.
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Try running Firefox in Diagnose Firefox issues using Troubleshoot Mode. If it works correctly in that configuration, then one of your add-ons is the culprit.