History Limiter Custom will help you keep your browser's history in check.
You set the number of days you want the history to be kept and any history older than the number of days set will be trimmed off.
- go to the extension's options page
- change the day value in the textfield to how many days you want to limit the history to, set it to 0 for no history
Based on nschneirov's History Limiter.