You may be thinking of the much-hated "Trusted Computing" initiative. "Trusted" here means that the JavaScript dev picks a sanitizing library they trust, not that Mozilla decides what software is trustworthy.
We use base 24, actually, but since we truncate before concatenating, we behave as expected here, unlike Gecko/WebKit. Obviously, a different TC that depends on one selector having more class names than another ("c" in CSS 2.1 6.4.3) will fail in Opera; it passes in GeckKit. See attachment at http://lists.w3.org/Archives/Public/www-style/2012Aug/0493.h... for an illustration.
I think there is still a long future for non-interactive/low-interactivity media. The original RFS acknowledged this. One project that aims to enable high-quality packaging independently of Hollywood is Lib-Ray [1]. Only a small part of the answer, but useful in its own right.