Probably in the moz_inputhistory table in places.sqlite.
And probably get rid of it by
browser.formfill.enable false.
I carry it from years ago, so I don't have any input/form history and therefore, the table is empty in my case.
If it was previously configurable in the preferences panel, I can't find it. Maybe was missing in the new versions.
EDIT: but here says that is moz_keywords and the above is for URLs :-?
http://kb.mozillazine.org/Places.sqlite
Anyway, I have both empty.
Edited 1 time(s). Last edit at 10/20/2015 06:57PM by JohnHell.