Nah, then you'd see an increased network usage. This is probably just Firefox's fsync bug repeated: in order to ensure data integrity, SQLite has a mode that fsyncs on commit. (After all, if the data isn't written to storage, it isn't really committed.) If you combine that with autocommit after every minor transaction, you get a ton of fsyncs and massive data usage.
bug? this one? Reported: 2008-03-07 03:10 PST, Status: RESOLVED FIXED ?