FVWM: Causing "firefox" to start in particular desktop page

Greetings,

since a few days I'm trying to set up "fvwm" in such a way that a "fire-
fox" window is always opened in page "0 0 1" rather than in page "0 0 0"
from where I'm issuing the "firefox" command.   From the manual page and
the FAQ I took the suggestion to use

   Style Firefox* StartsOnPage 0 0 1, SkipMapping
   Style * RecaptureHonorsStartsOnPage, CaptureHonorsStartsOnPage

and added  this to my  configuration file  using all four  variations of
"Firefox*", "*Firefox", "*Firefox*", and "Firefox", but it simply didn't
work here.

What am I doing wrong?  Any pointers appreciated.

Technical information:

I'm running on Xubuntu 16.04 and basically use "/usr/bin/fvwm --replace"
to autostart "fvwm" upon login.  Both, "fvwm" and "firefox" come direct-
ly from the Ubuntu distribution.  Apart from that:

$ lsb_release -a 2> /dev/null | grep Ubuntu
Distributor ID:	Ubuntu
Description:	Ubuntu 16.04.3 LTS
$ uname -r
4.13.0-21-generic
$ fvwm --version | head -2
fvwm 2.6.5 compiled on Jan 26 2016 at 23:13:57
with support for: ReadLine, RPlay, Stroke, XPM, PNG, SVG, Shape, XShm, SM, Bidi text, Xinerama, XRender, XCursor, XFT, NLS
$ firefox --version
Mozilla Firefox 58.0.2

Sincerely,
  Rainer