Arrow keys serve page upwards or downwards instead of the single line upward or down, can't change it back.

Keyboard up and down arrows use page up/page down instead of the single line up/down keys. I can't find how to change their return.

This has happened

Each time Firefox opened

is my last installed update

Maybe you turned Caret browsing. Press F7 and see if this is fixed.
http://KB.mozillazine.org/accessibility.browsewithcaret

Tags: Firefox

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