Suddenly pages scroll to the bottom and it is impossible to scroll up and stay up. This happens to all open tabs at once. Need to close Firefox and start over.

I was working on a secure page this time.
Happens every once in a while with no discernible pattern.

You may have switched on caret browsing.
*http://kb.mozillazine.org/accessibility.browsewithcaret
You can press press F7 (on Mac: fn + F7) to toggle caret browsing on/off.
*Tools > Options > Advanced : General: Accessibility: [ ] "Always use the cursor keys to navigate within pages"
*http://kb.mozillazine.org/Scrolling_with_arrow_keys_no_longer_works
*http://kb.mozillazine.org/Accessibility_features_of_Firefox

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