LSOs- Should I worry?

Recently I discovered the Firefox Addon called Better Privacy which removes Local Shared Objects, otherwise known as Super Cookies that are used to track your online movements.

I was wondering if LSOs are something to really worry about?

If they are, do you think this Addon tips browser usage in favor of Firefox?

And how does Safari handle LSOs, if at all? If not, any addons for it that does the same thing?

Thanks!