Re:Firefox 4 is here
by mbrubeck on Tuesday March 22, 2011 @12:42PM
(#2355155)
Yes, places.sqlite stores the history. The reason it grows by large increments (and does not shrink to very small sizes) is to prevent file fragmentation, which can have a big effect on the speed of the browser.
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And, I'd assume that even if deleting history doesn't shrink places.squlite, someone who wants to create a backup will be compressing it. And a mostly empty but large file should compress to a tiny file, right?