Form History Control is a free firefox add-on to view, edit, delete, selective clean-up, export/import form history entries.
Main features:
selectively delete privacy sensitive information.
search option.
easily correct misspelled entries.
control center.
filter the data either by keyword, active page, active field or cleanup criteria.
Individual or multiple entries can be deleted.
Never-Cleanup option
export/import the form history data.
Download Form History Control