History Limiter Custom

Limits the number of items the browser will keep in history by days.

A personal edit of nschneirov's History Limiter put up to share. Overall the logic remain unchanged from the original version. Main changes: - code reworks to eliminate need for jQuery and to facilitate manifest ver 2 - event page enabled - no changes to logic, no new functions The main aim of this edit is to make it event page enabled so it unloads when not needed thus saving memory. ================= CHANGELOG: 1.2 [21/04/2018] - back to using a set button to overcome the premature clear - some minor UI changes 1.1.1 [10/05/2014] - history will be trimmed right after the day value is edited 1.1 [27/04/2014] - tidying and restructuring of code - changed options page to auto save - added textfield number check - added working 0 days mode (no history)