--- a/browser/config/mozconfigs/linux32/devedition
+++ b/browser/config/mozconfigs/linux32/devedition
@@ -12,12 +12,14 @@ ac_add_options --enable-verify-mar
 
 # This will overwrite the default of stripping everything and keep the symbol table.
 # This is useful for profiling and debugging and only increases the package size
 # by 2 MBs.
 STRIP_FLAGS="--strip-debug"
 
 ac_add_options --with-branding=browser/branding/aurora
 
+ac_add_options --enable-diagnostic-assert
+
 mk_add_options MOZ_PGO=1
 
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/linux64/devedition
+++ b/browser/config/mozconfigs/linux64/devedition
@@ -12,12 +12,14 @@ ac_add_options --enable-verify-mar
 
 # This will overwrite the default of stripping everything and keep the symbol table.
 # This is useful for profiling and debugging and only increases the package size
 # by 2 MBs.
 STRIP_FLAGS="--strip-debug"
 
 ac_add_options --with-branding=browser/branding/aurora
 
+ac_add_options --enable-diagnostic-assert
+
 mk_add_options MOZ_PGO=1
 
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/macosx64/devedition
+++ b/browser/config/mozconfigs/macosx64/devedition
@@ -19,10 +19,12 @@ if test `uname -s` != Linux; then
 fi
 
 if test "${MOZ_UPDATE_CHANNEL}" = "nightly"; then
 ac_add_options --with-macbundlename-prefix=Firefox
 fi
 
 ac_add_options --with-branding=browser/branding/aurora
 
+ac_add_options --enable-diagnostic-assert
+
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/win32/devedition
+++ b/browser/config/mozconfigs/win32/devedition
@@ -8,12 +8,14 @@ fi
 
 # Add-on signing is not required for DevEdition
 MOZ_REQUIRE_SIGNING=0
 
 ac_add_options --enable-verify-mar
 
 ac_add_options --with-branding=browser/branding/aurora
 
+ac_add_options --enable-diagnostic-assert
+
 mk_add_options MOZ_PGO=1
 
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/win64/devedition
+++ b/browser/config/mozconfigs/win64/devedition
@@ -1,20 +1,23 @@
+
 if [ -n "$ENABLE_RELEASE_PROMOTION" ]; then
   MOZ_AUTOMATION_UPLOAD_SYMBOLS=1
   MOZ_AUTOMATION_UPDATE_PACKAGING=1
 fi
 
 . "$topsrcdir/build/mozconfig.win-common"
 . "$topsrcdir/browser/config/mozconfigs/win64/common-win64"
 . "$topsrcdir/browser/config/mozconfigs/win64/common-opt"
 
 # Add-on signing is not required for DevEdition
 MOZ_REQUIRE_SIGNING=0
 
 ac_add_options --enable-verify-mar
 
 ac_add_options --with-branding=browser/branding/aurora
 
+ac_add_options --enable-diagnostic-assert
+
 mk_add_options MOZ_PGO=1
 
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"