PithHelmet broken, fix It appears that PithHelmet, the content filtering/add-on tool for Safari is once again broken under Mac OS X 10.4.3. Until the developer updates the software, a poster to VersionTracker's discussion boards has found a workaround:
Close Safari.
Navigate to /Library/Application Support/SIMBL/PithHelmet.bundle.
Open bundle and go to Contents.
Open info.plist - You can use either Property List Editor or TextEdit.
Locate BundleIdentifier for com.apple.Safari.
Change BOTH MaxBundleVersion AND MinBundleVersion to 416.12.
Save and relaunch Safari.