Firefox Delete URL History from places.sqlite by days, week, or month

query.sqlite

-- open places.sqlite with sqlite2009 or your favorite editor then query:

-- Delete history older than 1 week
DELETE FROM moz_places WHERE datetime(last_visit_date / 1000000, 'unixepoch') < datetime('now', '-7 days')
DELETE FROM moz_historyvisits WHERE datetime(visit_date / 1000000, 'unixepoch') < datetime('now', '-7 days')

-- Delete history older than 1 month
DELETE FROM moz_places WHERE datetime(last_visit_date / 1000000, 'unixepoch') < datetime('now', '-1 month')
DELETE FROM moz_historyvisits WHERE datetime(visit_date / 1000000, 'unixepoch') < datetime('now', '-1 month')