hi arjan,
this is my first real contribution to furthering knowledge on the list!
i've gotten the point-and-click to work on macos 10.3.9 with ly 2.5.23,
but with a couple of ticks which you (or maybe han-wen or others?) could
help me iron out.
the solution was to do everything in xwindows with x11 and not from the
terminal.app (which you perhaps already knew?)
here's what i did:
1) i installed firefox from FINK to be run from an xterm in apple's x11.
2) i added the following lines to the prefs.js file in
~HOME/.mozilla/firefox/vgftrus6.default/, with the full path to the
lilypond-pdfpc-helper (not given on the lilypond website documentation):