Only on a USB or FireWire disk, so that you do not delete your main installation. The thing is, if your problems disappear with a clean installation (no third party software), then your problem is probably one of the third party applications/extensions/GUI-modifications and so on. In some cases the deinstallation of questionable components and a restart help.Mr. Retrofire - They are for the ML sidebar which idiotically replaces the personalized folder icons with its dull grey ones. Are you inquiring or suggesting that I remove it?
ML clean installation is way over my head, but Firefox is doable. I already did a clean install a few weeks ago. Would you still recommend another one?