Script that cleans up Firefox data files on Mac OS X, useful for "old" installs that get slower with time. I used Automator.app to make it run when I login, so whenever I reboot the computer I get a fresh, snappier Firefox!

vacuum_firefox_mac.sh

#!/bin/bash

# Closes any running Firefox (you'd better close it manually,
# but this is a safeguard)
killall firefox

# Defragments all databases. A few will result in "Error: file
# is encrypted or is not a database". It's fine, they will be
# skipped and no harm will be done.
for f in ~/Library/Application\ Support/Firefox/Profiles/*/*.sqlite; do sqlite3 "$f" 'VACUUM;'; done

# Reopens Firefox - comment with '#' if you don't want it to happen
open /Applications/Firefox.app