How to set the default Netscape Navigator window size and position

On Macintosh and Windows, if you want your Netscape Navigator windows to
always appear at a specific place on your screen and at a specific size,
then position and resize a Netscape Navigator window exactly how you
want it and select "Save Options" from the "Options" menu.  This will
save the foremost window's size and position as the default to use for
all future windows.
On Unix, use the command-line option:
    -geometry =620x950+630+40
This will set the size and position of the first window created, and
will also define the size (but not position) of subsequent windows.
There are also X resources you can set (on Unix) to define the default
window size and position.  In versions 1.0 and 1.1, use this X resource:
    Netscape.TopLevelShell.geometry: =620x950+630+40
However, in version 2.0 and newer, that will set the size of *all* of
Netscape's top-level windows, including bookmarks and message
composition windows, which is probably not what you want.  In 2.0, you
can set the default sizes and positions of the various windows like this:
    Netscape*Navigator.geometry: =WxH+X+Y    for the browser windows
    Netscape*Mail.geometry: =WxH+X+Y         for the mail window
    Netscape*News.geometry: =WxH+X+Y         for the news window
    Netscape*Bookmark.geometry: =WxH+X+Y     for the bookmarks window
    Netscape*AddressBook.geometry: =WxH+X+Y  for the address book window
    Netscape*Composition.geometry: =WxH+X+Y  for the composition window