diff --git a/mozilla/tools/tinderbox-configs/firefox/linux/CLOBBER b/mozilla/tools/tinderbox-configs/firefox/linux/CLOBBER
index 001dbbd313e..9f9f6689e71 100644
--- a/mozilla/tools/tinderbox-configs/firefox/linux/CLOBBER
+++ b/mozilla/tools/tinderbox-configs/firefox/linux/CLOBBER
@@ -1 +1 @@
-Clobbering to pick up peterv's crash fix in bug 401687.
+Clobbering to generate a new nightly for testing.
diff --git a/mozilla/tools/tinderbox-configs/firefox/macosx/CLOBBER b/mozilla/tools/tinderbox-configs/firefox/macosx/CLOBBER
index 001dbbd313e..0fa12686b5a 100644
--- a/mozilla/tools/tinderbox-configs/firefox/macosx/CLOBBER
+++ b/mozilla/tools/tinderbox-configs/firefox/macosx/CLOBBER
@@ -1 +1,2 @@
-Clobbering to pick up peterv's crash fix in bug 401687.
+Clobbering to test some different build optimization flags for sayrer.
+Also clobbering to generate a new nightly for testing.
diff --git a/mozilla/tools/tinderbox-configs/firefox/macosx/mozconfig b/mozilla/tools/tinderbox-configs/firefox/macosx/mozconfig
index c5147a62669..1c556943892 100644
--- a/mozilla/tools/tinderbox-configs/firefox/macosx/mozconfig
+++ b/mozilla/tools/tinderbox-configs/firefox/macosx/mozconfig
@@ -12,7 +12,7 @@ mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/../build/universal
 
 ac_add_options --enable-application=browser
 ac_add_options --enable-update-channel=nightly
-ac_add_options --enable-optimize="-O2 -g"
+ac_add_options --enable-optimize="-Oz -gfull"
 ac_add_options --disable-debug
 ac_add_options --disable-tests
 ac_add_options --enable-update-packaging
diff --git a/mozilla/tools/tinderbox-configs/firefox/win32/CLOBBER b/mozilla/tools/tinderbox-configs/firefox/win32/CLOBBER
index 001dbbd313e..9f9f6689e71 100644
--- a/mozilla/tools/tinderbox-configs/firefox/win32/CLOBBER
+++ b/mozilla/tools/tinderbox-configs/firefox/win32/CLOBBER
@@ -1 +1 @@
-Clobbering to pick up peterv's crash fix in bug 401687.
+Clobbering to generate a new nightly for testing.