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when i hit page down key it goes down page the first time i hit key and the second time I hit key it goes back up instead of down. how do i correct

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when i hit page down key it goes down page the first time i hit key and the second time I hit key it goes back up instead of down. how do i correct. could be from the add ons i added and occurs when I am on webpages

when i hit page down key it goes down page the first time i hit key and the second time I hit key it goes back up instead of down. how do i correct. could be from the add ons i added and occurs when I am on webpages

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You may have switched on caret browsing.

You can toggle caret browsing on/off by pressing F7 (Mac: fn + F7).

  • Options/Preferences -> Advanced -> General -> Accessibility: [ ] "Always use the cursor keys to navigate within pages"

Note that this is an accessibility feature of Firefox.