For quite a few days now (not sure since when) the Windows SeaMonkey builds in the packaging step: ========= Started 'python2.7 e:/builds/slave/c-cen-t-w32-dbg/build/build/pymake/make.py ...' failed (results: 2, elapsed: 10 secs) (at 2013-11-01 23:23:52.319317) ========== 'python2.7' 'e:/builds/slave/c-cen-t-w32-dbg/build/build/pymake/make.py' 'package' [...] e:/builds/slave/c-cen-t-w32-dbg/build/objdir/mozilla/_virtualenv/Scripts/python.exe e:/builds/slave/c-cen-t-w32-dbg/build/mozilla/toolkit/mozapps/installer/packager.py -DOSTYPE=\"WINNT5.2\" -DOSARCH=WINNT -DNO_NSPR_10_SUPPORT -DAB_CD=en-US -DMOZ_APP_NAME=seamonkey -DPREF_DIR=defaults/pref -DJAREXT= -DENABLE_TESTS=1 -DMOZ_ANGLE_RENDERER=1 -DMOZ_D3DCOMPILER_DLL=D3DCompiler_43.dll -DMOZ_DEBUG=1 -DMOZ_PACKAGE_DEBUGQA=1 -D_MSC_VER=1600 -DMOZ_URL_CLASSIFIER=1 -DMOZ_UPDATER=1 -DNECKO_WIFI=1 -DMOZ_MSVC_REDIST=1600 -DMOZ_SHARED_MOZGLUE=1 -DWIN_OR_OS2=1 -DMOZ_CHILD_PROCESS_NAME=plugin-container.exe -DDLL_PREFIX= -DDLL_SUFFIX=.dll -DBIN_SUFFIX=.exe -DBINPATH=bin \ --format omni \ [...] Error: e:\builds\slave\c-cen-t-w32-dbg\build\objdir\suite\installer\package-manifest:367: Missing file(s): bin/extensions/modern@themes.mozilla.org.xpi This broke sometime between 21th and 30th of October, cannot narrow this down more exactly via official builds as other build errors occurred during that time.

Dupe of Bug 934013?

Indeed, that bug is missing a bit of info though ;)