diff --git a/plugins/xpcom/Makefile b/plugins/xpcom/Makefile
index 4ee7372..3fb1587 100644
--- a/plugins/xpcom/Makefile
+++ b/plugins/xpcom/Makefile
@@ -200,6 +200,7 @@
 	$(MAKE) lib BROWSER=ff35
 	$(MAKE) lib BROWSER=ff36
 	$(MAKE) lib BROWSER=ff40
+	$(MAKE) lib BROWSER=ff50
 
 SRCS =	\
 		ExternalWrapper.cpp \
diff --git a/plugins/xpcom/prebuilt/extension/chrome.manifest b/plugins/xpcom/prebuilt/extension/chrome.manifest
index 18c2327..6fbd213 100644
--- a/plugins/xpcom/prebuilt/extension/chrome.manifest
+++ b/plugins/xpcom/prebuilt/extension/chrome.manifest
@@ -13,6 +13,8 @@
 # Firefox 5
 binary-component lib/Linux_x86_64-gcc3/ff50/libgwt_dev_ff50.so ABI=Linux_x86_64-gcc3 appversion<=5.0.*
 binary-component lib/Linux_x86-gcc3/ff50/libgwt_dev_ff50.so ABI=Linux_x86-gcc3 appversion<=5.0.*
+binary-component lib/Darwin-gcc3/ff50/libgwt_dev_ff50.dylib ABI=Darwin_x86_64-gcc3 appversion<=5.0.*
+binary-component lib/Darwin-gcc3/ff50/libgwt_dev_ff50.dylib ABI=Darwin_x86-gcc3 appversion<=5.0.*
 binary-component lib/WINNT_x86-msvc/ff50/xpGwtDevPlugin.dll ABI=WINNT_x86-msvc appversion<=5.0.*
 
 interfaces components/IOOPHM.xpt
diff --git a/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff3/libgwt_dev_ff3.dylib b/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff3/libgwt_dev_ff3.dylib
index 809ba1c..a51473a 100755
--- a/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff3/libgwt_dev_ff3.dylib
+++ b/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff3/libgwt_dev_ff3.dylib
Binary files differ
diff --git a/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff35/libgwt_dev_ff35.dylib b/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff35/libgwt_dev_ff35.dylib
index 6ad16f0..2226927 100755
--- a/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff35/libgwt_dev_ff35.dylib
+++ b/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff35/libgwt_dev_ff35.dylib
Binary files differ
diff --git a/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff36/libgwt_dev_ff36.dylib b/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff36/libgwt_dev_ff36.dylib
index 0aa5a31..d030ed1 100755
--- a/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff36/libgwt_dev_ff36.dylib
+++ b/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff36/libgwt_dev_ff36.dylib
Binary files differ
diff --git a/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff40/libgwt_dev_ff40.dylib b/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff40/libgwt_dev_ff40.dylib
index 4b056d1..daeaab3 100755
--- a/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff40/libgwt_dev_ff40.dylib
+++ b/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff40/libgwt_dev_ff40.dylib
Binary files differ
diff --git a/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff50/libgwt_dev_ff50.dylib b/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff50/libgwt_dev_ff50.dylib
new file mode 100755
index 0000000..6998a72
--- /dev/null
+++ b/plugins/xpcom/prebuilt/extension/lib/Darwin-gcc3/ff50/libgwt_dev_ff50.dylib
Binary files differ
diff --git a/plugins/xpcom/prebuilt/gwt-dev-plugin.xpi b/plugins/xpcom/prebuilt/gwt-dev-plugin.xpi
index 791d0d5..c118f82 100644
--- a/plugins/xpcom/prebuilt/gwt-dev-plugin.xpi
+++ b/plugins/xpcom/prebuilt/gwt-dev-plugin.xpi
Binary files differ