Reusing some mozilla documentation

What's the rule on re-using mozilla documentation with regard to
preserving copyright?

I want to adapt the "Using the Help Window" page for use in Open
Komodo. This is the file I'm talking about:

 http://lxr.mozilla.org/mozilla1.8/source/extensions/help/resources/locale/en-US/help_help.xhtml

I can't find any licensing information and there are no contributors
listed in the file. I also couldn't find any clear direction on how to
handle this in the "Legal stuff" section here:

 http://www.mozilla.org/contribute/writing/process

Would it be OK for me to use this as long as I attribute Mozilla as
the original authors? I would just leave the copyright notice as is,
but I'm adding some stuff about the help viewer keybindings.

TT