This is a placeholder bug for the setting in Chimera. If I read the tree correctly, if the default is turned off in the trunk, that will turn it off in the daily builds. I'm (still) using Camino 0.7, and the all.js has it on by default.
ben, what's the bug number on the trunk?
Mike, the bug is 133371, I marked it as depends. If we fix that bug, you are going to inheret the change.