2 ways to do it:
1. Install the VacuumPlaces extension or
2. Follow these instructions:
- Open the Error Console: Tools menu/Error Console
- In the Code text box paste this (it’s a single line):
Components.classes["@mozilla.org/browser/nav-history-service;1"].getService(Components.interfaces.nsPIPlacesDatabase).DBConnection.executeSimpleSQL("VACUUM");- Press Evaluate. All the UI will freeze for a few seconds while databases are VACUUMed
from mozillalinks, hat-tip lifehacker.
UPDATE: The VacuumPlaces extension has been improved. hat-tip lifehacker.
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