diff --git a/im/config/mozconfigs/linux/mozconfig b/im/config/mozconfigs/linux/mozconfig
index 05683a4601..c16b4c64ef 100644
--- a/im/config/mozconfigs/linux/mozconfig
+++ b/im/config/mozconfigs/linux/mozconfig
@@ -21,7 +21,7 @@ mk_add_options MOZ_MAKE_FLAGS="-j4"
 
 ac_add_options --with-ccache
 ac_add_options --enable-application=im
-# ac_add_options --enable-extensions=purple
+ac_add_options --enable-extensions=purple
 ac_add_options --enable-update-channel=nightly
 ac_add_options --enable-optimize
 ac_add_options --disable-debug
diff --git a/im/config/mozconfigs/macosx/mozconfig b/im/config/mozconfigs/macosx/mozconfig
index 79937d493d..6238d9829d 100644
--- a/im/config/mozconfigs/macosx/mozconfig
+++ b/im/config/mozconfigs/macosx/mozconfig
@@ -23,7 +23,7 @@ ac_add_options --enable-debug-symbols="-gdwarf-2"
 mk_add_options MOZ_MAKE_FLAGS="-sj10"
 
 ac_add_options --enable-application=im
-# ac_add_options --enable-extensions=purple
+ac_add_options --enable-extensions=purple
 ac_add_options --enable-update-channel=nightly
 ac_add_options --enable-optimize
 ac_add_options --disable-debug
diff --git a/im/config/mozconfigs/win32/mozconfig b/im/config/mozconfigs/win32/mozconfig
index 91220dc5ed..d0c9fab960 100644
--- a/im/config/mozconfigs/win32/mozconfig
+++ b/im/config/mozconfigs/win32/mozconfig
@@ -10,7 +10,7 @@ export MOZILLA_OFFICIAL=1
 export MOZ_DEBUG_SYMBOLS=1
 
 ac_add_options --enable-application=im
-# ac_add_options --enable-extensions=purple
+ac_add_options --enable-extensions=purple
 ac_add_options --enable-update-channel=nightly
 ac_add_options --enable-optimize
 ac_add_options --disable-debug