Comment 83 for bug 233901

> Firstly the guide doesn't explain how to set the default homepage.

that's bug 178685

> Also, the guide suggests that sysadmins set things in all.js. This doesn't
> work for most settings (at least on Linux). To set fonts, network proxies and
> paper sizes, I had to use unix.js.

The doc says the platform-specific file (e.g unix.js) is loaded after all.js .
As Mozilla code changes constantly, we don't want to document what prefs are
loaded in platform-specific file.