www/firefox: Installation fails: mozpack.errors.ErrorMessage: Error: Error while running startup cache precompilation

[O. Hartmann]

Reinstallation of port www/firefox fails on recent FreeBSD CURRENT
(FreeBSD 10.0-CURRENT #1 r253953: Mon Aug  5 10:58:51 CEST 2013 amd64)
with the following error:

[...]
resource://gre/modules/devtools/dbg-server.jsm
Traceback (most recent call last):
  File
"/usr/ports/www/firefox/work/mozilla-release/toolkit/mozapps/installer/packager.py",
line 374, in <module> main() File
"/usr/ports/www/firefox/work/mozilla-release/toolkit/mozapps/installer/packager.py",
line 366, in main args.source, gre_path, base) File
"/usr/ports/www/firefox/work/mozilla-release/toolkit/mozapps/installer/packager.py",
line 147, in precompile_cache errors.fatal('Error while running startup
cache precompilation') File
"/usr/ports/www/firefox/work/mozilla-release/python/mozbuild/mozpack/errors.py",
line 101, in fatal self._handle(self.FATAL, msg) File
"/usr/ports/www/firefox/work/mozilla-release/python/mozbuild/mozpack/errors.py",
line 96, in _handle raise ErrorMessage(msg)
mozpack.errors.ErrorMessage: Error: Error while running startup cache
precompilation gmake[3]: *** [stage-package] Error 1 gmake[3]: Leaving
directory
`/usr/ports/www/firefox/work/mozilla-release/obj-x86_64-portbld-freebsd10.0/browser/installer'
gmake[2]: *** [install] Error 2 gmake[2]: Leaving directory
`/usr/ports/www/firefox/work/mozilla-release/obj-x86_64-portbld-freebsd10.0'
*** Error code 2

Stop.
make[1]: stopped in /usr/ports/www/firefox
*** Error code 1
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