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Firefox uses SQLite databases to store bookmarks, history and other data. SQLite is a light but powerful database management system and is also used by other web browsers like Chrome and Opera for local data storage.
One problem users may encounter is that over time the databases become fragmented and larger than they need to be. when a large amount of data is deleted from the database file it leaves behind free space.
The method used to defragment a database is to totally rebuild it without fragmentation by copying its contents into a temporary database file and then overwriting the original back again. This process is usually called compacting (or ‘vacuuming’) the database. Privacy Eraser will automatically compact the database if the fragmentation rate more than 20%.
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