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How can I stop Firefox from changing Tabs/pages when I use the up/down arrows for scrolling?

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A recent update is causing the browser to switch between tabs, or even go on to other pages, when I use the keyboard navigation arrows to scroll down the page. This is aggravating, especially when filling out a form, which can submit before completion. The tab switching occurs mostly when the focus is not in a specific portion of the web page, such as when I have selected a tab. I I can find no way to disable this behavior. Win 7 Ultimate fully patched, Firefox version 35.0.1

A recent update is causing the browser to switch between tabs, or even go on to other pages, when I use the keyboard navigation arrows to scroll down the page. This is aggravating, especially when filling out a form, which can submit before completion. The tab switching occurs mostly when the focus is not in a specific portion of the web page, such as when I have selected a tab. I I can find no way to disable this behavior. Win 7 Ultimate fully patched, Firefox version 35.0.1

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Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

  • Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
  • Do NOT click the Reset button on the Safe Mode start window