I have noticed that the script shield works sporadically with Firefox, a little bit more consistently with Opera, but is seems most consistent with IE.
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AMD Athlon XP 3000+ sp3 2.17GHz, 1.50Gb ram, avast!7.0.1426, Privatefirewall 7, Malwarebytes free, superantispyware free, Winpatrol free, Slimcleaner 3, 360Amigo sys.optimizer.