--- a/config/config.mk
+++ b/config/config.mk
@@ -243,22 +243,20 @@ ifneq (,$(MOZ_BROWSE_INFO)$(MOZ_BSCFILE)
 OS_CFLAGS += -FR
 OS_CXXFLAGS += -FR
 endif
 else # ! MOZ_DEBUG
 
 # We don't build a static CRT when building a custom CRT,
 # it appears to be broken. So don't link to jemalloc if
 # the Makefile wants static CRT linking.
-ifndef MOZILLA_1_9_1_BRANCH
 ifeq ($(MOZ_MEMORY)_$(USE_STATIC_LIBS),1_)
 # Disable default CRT libs and add the right lib path for the linker
 OS_LDFLAGS += $(MOZ_MEMORY_LDFLAGS)
 endif
-endif
 
 # MOZ_DEBUG_SYMBOLS generates debug symbols in separate PDB files.
 # Used for generating an optimized build with debugging symbols.
 # Used in the Windows nightlies to generate symbols for crash reporting.
 ifdef MOZ_DEBUG_SYMBOLS
 OS_CXXFLAGS += -Zi -UDEBUG -DNDEBUG
 OS_CFLAGS += -Zi -UDEBUG -DNDEBUG
 OS_LDFLAGS += -DEBUG -OPT:REF -OPT:nowin98

--- a/config/version.mk
+++ b/config/version.mk
@@ -41,21 +41,17 @@ INCLUDED_VERSION_MK=1
 # TODO:
 # PBI      : Private build info.  Not used currently.
 #            Guessing the best way would be to set an env var.
 # BINARY   : Binary name.  Not used currently.
 ifeq ($(MOZ_WIDGET_TOOLKIT),windows)
 ifndef RESFILE
 RCFILE=./module.rc
 RESFILE=./module.res
-ifdef MOZILLA_1_9_1_BRANCH
-_RC_STRING = -QUIET 1 -DEPTH $(MOZDEPTH) -TOPSRCDIR $(MOZILLA_SRCDIR) -BITS $(MOZ_BITS) -OBJDIR . -SRCDIR $(srcdir) -DISPNAME $(MOZ_APP_DISPLAYNAME) -APPVERSION $(MOZ_APP_VERSION)
-else
 _RC_STRING = -QUIET 1 -DEPTH $(MOZDEPTH) -TOPSRCDIR $(MOZILLA_SRCDIR) -OBJDIR . -SRCDIR $(srcdir) -DISPNAME $(MOZ_APP_DISPLAYNAME) -APPVERSION $(MOZ_APP_VERSION)
-endif
 ifneq ($(BUILD_OFFICIAL)_$(MOZILLA_OFFICIAL),_)
 _RC_STRING += -OFFICIAL 1
 endif
 ifdef MOZ_DEBUG
 _RC_STRING += -DEBUG 1
 endif
 ifdef MODULE
 _RC_STRING += -MODNAME $(MODULE)

--- a/configure.in
+++ b/configure.in
@@ -374,18 +374,18 @@ if test -n "$CROSS_COMPILE" && test "$ta
       powerpc-apple-darwin8*:i?86-apple-darwin*)
         dnl The Darwin cross compiler doesn't necessarily point itself at a
         dnl root that has libraries for the proper architecture, it defaults
         dnl to the system root.  The libraries in the system root on current
         dnl versions of PPC OS X 10.4 aren't fat, so these target compiler
         dnl checks will fail.  Fake a working SDK in that case.
         _SAVE_CFLAGS=$CFLAGS
         _SAVE_CXXFLAGS=$CXXLAGS
-        dnl 1.9.1 and 1.9.2 support 10.4, 1.9.3 and later don't.
-        if test "$MOZILLA_1_9_1_BRANCH" = "1" -o "$MOZILLA_1_9_2_BRANCH" = "1";
+        dnl 1.9.2 support 10.4, 1.9.3 and later don't.
+        if test "$MOZILLA_1_9_2_BRANCH" = "1";
         then
         CFLAGS="-isysroot /Developer/SDKs/MacOSX10.4u.sdk $CFLAGS"
         CXXFLAGS="-isysroot /Developer/SDKs/MacOSX10.4u.sdk $CXXFLAGS"
         else
         CFLAGS="-isysroot /Developer/SDKs/MacOSX10.5.sdk $CFLAGS"
         CXXFLAGS="-isysroot /Developer/SDKs/MacOSX10.5.sdk $CXXFLAGS"
         fi
         ;;
@@ -956,18 +956,18 @@ AC_SUBST(HAS_XCODE_2_1)
 dnl The universal machinery sets UNIVERSAL_BINARY to inform packager.mk
 dnl that a universal binary is being produced.
 AC_SUBST(UNIVERSAL_BINARY)
 
 dnl ========================================================
 dnl Check for MacOS deployment target version
 dnl ========================================================
 
-dnl 1.9.1 and 1.9.2 support 10.4, 1.9.3 and later don't.
-if test "$MOZILLA_1_9_1_BRANCH" = "1" -o "$MOZILLA_1_9_2_BRANCH" = "1"; then
+dnl 1.9.2 support 10.4, 1.9.3 and later don't.
+if test "$MOZILLA_1_9_2_BRANCH" = "1"; then
 MOZ_ARG_ENABLE_STRING(macos-target,
                       [  --enable-macos-target=VER (default=10.4)
                           Set the minimum MacOS version needed at runtime],
                       [_MACOSX_DEPLOYMENT_TARGET=$enableval])
 else
 MOZ_ARG_ENABLE_STRING(macos-target,
                       [  --enable-macos-target=VER (default=10.5)
                           Set the minimum MacOS version needed at runtime],
@@ -979,17 +979,17 @@ case "$target" in
     if test -n "$_MACOSX_DEPLOYMENT_TARGET" ; then
         dnl Use the specified value
         export MACOSX_DEPLOYMENT_TARGET=$_MACOSX_DEPLOYMENT_TARGET
         AC_DEFINE_UNQUOTED(__ENVIRONMENT_MAC_OS_X_VERION_MIN_REQUIRED__,$_MACOSX_DEPLOYMENT_TARGET)
     elif test -z "$MACOSX_DEPLOYMENT_TARGET" ; then
         dnl No value specified on the command line or in the environment,
         dnl use the lesser of the application's minimum or the architecture's
         dnl minimum.
-        if test "$MOZILLA_1_9_1_BRANCH" = "1" -o "$MOZILLA_1_9_2_BRANCH" = "1"; then
+        if test "$MOZILLA_1_9_2_BRANCH" = "1"; then
         export MACOSX_DEPLOYMENT_TARGET=10.4
         else
         export MACOSX_DEPLOYMENT_TARGET=10.5
         fi
     fi
     ;;
 esac
 
@@ -2146,17 +2146,17 @@ case "$target" in
     MKSHLIB='$(LD) -NOLOGO -DLL -OUT:$@ $(DSO_LDOPTS)'
     MKSHLIB_FORCE_ALL=
     MKSHLIB_UNFORCE_ALL=
     MOZ_COMPONENT_NSPR_LIBS='$(NSPR_LIBS)'
     MOZ_COMPONENT_NSPR_LIBS='$(NSPR_LIBS)'
     MOZ_DEBUG_FLAGS='-Zi'
     MOZ_DEBUG_LDFLAGS='-DEBUG -DEBUGTYPE:CV'
     MOZ_FIX_LINK_PATHS=
-    if test "$MOZILLA_1_9_1_BRANCH" = "1" -o "$MOZILLA_1_9_2_BRANCH" = "1"; then
+    if test "$MOZILLA_1_9_2_BRANCH" = "1"; then
         MOZ_JS_LIBS='$(LIBXUL_DIST)/lib/js$(MOZ_BITS)$(VERSION_NUMBER).lib'
     else
         MOZ_JS_LIBS='$(LIBXUL_DIST)/lib/mozjs.lib'
     fi
     MOZ_XPCOM_OBSOLETE_LIBS='$(LIBXUL_DIST)/lib/xpcom_compat.lib'
     OBJ_SUFFIX=obj
     RANLIB='echo not_ranlib'
     STRIP='echo not_strip'
@@ -2209,17 +2209,17 @@ case "$target" in
         DSO_LDOPTS='-shared'
         MKSHLIB='$(CXX) $(DSO_LDOPTS) -o $@'
         MKCSHLIB='$(CC) $(DSO_LDOPTS) -o $@'
         RC='$(WINDRES)'
         # Use temp file for windres (bug 213281)
         RCFLAGS='-O coff --use-temp-file'
         # mingw doesn't require kernel32, user32, and advapi32 explicitly
         LIBS="$LIBS -lgdi32 -lwinmm -lwsock32"
-        if test "$MOZILLA_1_9_1_BRANCH" = "1" -o "$MOZILLA_1_9_2_BRANCH" = "1"; then
+        if test "$MOZILLA_1_9_2_BRANCH" = "1"; then
             MOZ_JS_LIBS='-L$(LIBXUL_DIST)/lib -ljs$(MOZ_BITS)$(VERSION_NUMBER)'
         fi
         MOZ_FIX_LINK_PATHS=
         DYNAMIC_XPCOM_LIBS='-L$(LIBXUL_DIST)/lib -lxpcom -lxpcom_core'
         XPCOM_FROZEN_LDOPTS='-L$(LIBXUL_DIST)/lib -lxpcom'
         DLL_PREFIX=
         IMPORT_LIB_SUFFIX=dll.a
     else
@@ -2248,17 +2248,17 @@ case "$target" in
         DSO_LDOPTS=-SUBSYSTEM:WINDOWS
         CFLAGS="$CFLAGS -W3 -Gy -Fd\$(COMPILE_PDBFILE)"
         CXXFLAGS="$CXXFLAGS -W3 -Gy -Fd\$(COMPILE_PDBFILE)"
         LIBS="$LIBS kernel32.lib user32.lib gdi32.lib winmm.lib wsock32.lib advapi32.lib"
         MOZ_DEBUG_FLAGS='-Zi'
         MOZ_DEBUG_LDFLAGS='-DEBUG -DEBUGTYPE:CV'
         WARNINGS_AS_ERRORS='-WX'
     	MOZ_OPTIMIZE_FLAGS='-O1'
-        if test "$MOZILLA_1_9_1_BRANCH" = "1" -o "$MOZILLA_1_9_2_BRANCH" = "1"; then
+        if test "$MOZILLA_1_9_2_BRANCH" = "1"; then
             MOZ_JS_LIBS='$(LIBXUL_DIST)/lib/js$(MOZ_BITS)$(VERSION_NUMBER).lib'
         else
             MOZ_JS_LIBS='$(LIBXUL_DIST)/lib/mozjs.lib'
         fi
         MOZ_FIX_LINK_PATHS=
         DYNAMIC_XPCOM_LIBS='$(LIBXUL_DIST)/lib/xpcom.lib $(LIBXUL_DIST)/lib/xpcom_core.lib'
         XPCOM_FROZEN_LDOPTS='$(LIBXUL_DIST)/lib/xpcom.lib'
         LIBXUL_LIBS='$(LIBXUL_DIST)/lib/xpcom.lib $(LIBXUL_DIST)/lib/xul.lib'
@@ -3075,21 +3075,17 @@ EOF
                          if test `grep -c "@PLT" conftest.S` = 0; then
                            ac_cv_visibility_builtin_bug=yes
                          fi
                        fi
                        rm -f conftest.{c,S}
                        ])
         if test "$ac_cv_have_visibility_builtin_bug" = "no" -a \
                 "$ac_cv_have_visibility_class_bug" = "no"; then
-if test "$MOZILLA_1_9_1_BRANCH" = "1"; then
-          VISIBILITY_FLAGS='-I$(DIST)/include/system_wrappers -include $(MOZILLA_SRCDIR)/config/gcc_hidden.h'
-else
           VISIBILITY_FLAGS='-I$(DIST)/system_wrappers -include $(MOZILLA_SRCDIR)/config/gcc_hidden.h'
-fi
         else
           VISIBILITY_FLAGS='-fvisibility=hidden'
         fi # have visibility pragma bug
       fi   # have visibility pragma
     fi     # have visibility(default) attribute
   fi       # have visibility(hidden) attribute
 fi         # GNU_CC