mozilla-firefox-3.5.2 and mozilla-firefox-3.5.2-r1 should PDEPEND on >=www-plugins/noscript-1.9.6.6 because noscript-1.8.8 and noscript-1.9.0.4 are considered as uncompatible by mozilla-firefox-3.5. Didn't test with ff-bin but surely the same. By the way, you should check for noscript RDEPEND, is it still working with >=1.5 ?
Fixed in mozilla-firefox-3.5.2-r3