--- a/browser/config/mozconfigs/linux32/debug
+++ b/browser/config/mozconfigs/linux32/debug
@@ -12,13 +12,13 @@ export MOZILLA_OFFICIAL=1
 # Enable Telemetry
 export MOZ_TELEMETRY_REPORTING=1
 
 #Use ccache
 
 # Package js shell.
 export MOZ_PACKAGE_JSSHELL=1
 
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --with-branding=browser/branding/nightly
 
 . "$topsrcdir/build/mozconfig.rust"
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/linux32/l10n-mozconfig
+++ b/browser/config/mozconfigs/linux32/l10n-mozconfig
@@ -1,13 +1,13 @@
 no_sccache=1
 
 ac_add_options --with-l10n-base=../../l10n
 ac_add_options --enable-update-channel=${MOZ_UPDATE_CHANNEL}
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --enable-official-branding
 
 . $topsrcdir/build/unix/mozconfig.linux32
 
 export MOZILLA_OFFICIAL=1
 
 # Enable Telemetry
 export MOZ_TELEMETRY_REPORTING=1
 

--- a/browser/config/mozconfigs/linux32/nightly
+++ b/browser/config/mozconfigs/linux32/nightly
@@ -3,13 +3,13 @@
 
 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 --with-branding=browser/branding/nightly
 
 . "$topsrcdir/build/mozconfig.rust"
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/linux64/debug
+++ b/browser/config/mozconfigs/linux64/debug
@@ -10,13 +10,13 @@ MOZ_AUTOMATION_L10N_CHECK=0
 export MOZILLA_OFFICIAL=1
 
 # Enable Telemetry
 export MOZ_TELEMETRY_REPORTING=1
 
 # Package js shell.
 export MOZ_PACKAGE_JSSHELL=1
 
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --with-branding=browser/branding/nightly
 
 . "$topsrcdir/build/mozconfig.rust"
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/linux64/l10n-mozconfig
+++ b/browser/config/mozconfigs/linux64/l10n-mozconfig
@@ -1,13 +1,13 @@
 no_sccache=1
 
 ac_add_options --with-l10n-base=../../l10n
 ac_add_options --enable-update-channel=${MOZ_UPDATE_CHANNEL}
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --enable-official-branding
 
 . $topsrcdir/build/unix/mozconfig.linux
 
 export MOZILLA_OFFICIAL=1
 
 # Enable Telemetry
 export MOZ_TELEMETRY_REPORTING=1
 

--- a/browser/config/mozconfigs/linux64/nightly
+++ b/browser/config/mozconfigs/linux64/nightly
@@ -3,13 +3,13 @@
 
 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 --with-branding=browser/branding/nightly
 
 . "$topsrcdir/build/mozconfig.rust"
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/macosx64/debug
+++ b/browser/config/mozconfigs/macosx64/debug
@@ -12,13 +12,13 @@ export MOZ_TELEMETRY_REPORTING=1
 
 if test "${MOZ_UPDATE_CHANNEL}" = "nightly"; then
 ac_add_options --with-macbundlename-prefix=Firefox
 fi
 
 # Package js shell.
 export MOZ_PACKAGE_JSSHELL=1
 
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --with-branding=browser/branding/nightly
 
 . "$topsrcdir/build/mozconfig.rust"
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/macosx64/l10n-mozconfig
+++ b/browser/config/mozconfigs/macosx64/l10n-mozconfig
@@ -1,12 +1,12 @@
 . "$topsrcdir/browser/config/mozconfigs/common"
 
 ac_add_options --with-l10n-base=../../l10n
 ac_add_options --enable-update-channel=${MOZ_UPDATE_CHANNEL}
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --enable-official-branding
 
 # Don't autoclobber l10n, as this can lead to missing binaries and broken builds
 # Bug 1283438
 mk_add_options AUTOCLOBBER=
 
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/macosx64/nightly
+++ b/browser/config/mozconfigs/macosx64/nightly
@@ -10,13 +10,13 @@ export MOZ_TELEMETRY_REPORTING=1
 
 if test "${MOZ_UPDATE_CHANNEL}" = "nightly"; then
 ac_add_options --with-macbundlename-prefix=Firefox
 fi
 
 # Package js shell.
 export MOZ_PACKAGE_JSSHELL=1
 
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --with-branding=browser/branding/nightly
 
 . "$topsrcdir/build/mozconfig.rust"
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/whitelist
+++ b/browser/config/mozconfigs/whitelist
@@ -5,17 +5,17 @@ whitelist = {
     'nightly': {},
     }
 
 all_platforms = ['win64', 'win32', 'linux32', 'linux64', 'macosx-universal']
 
 for platform in all_platforms:
     whitelist['nightly'][platform] = [
         'ac_add_options --enable-update-channel=nightly',
-        'ac_add_options --with-branding=browser/branding/aurora',
+        'ac_add_options --with-branding=browser/branding/nightly',
         'ac_add_options --enable-profiling',
         'mk_add_options CLIENT_PY_ARGS="--hg-options=\'--verbose --time\' --hgtool=../tools/buildfarm/utils/hgtool.py --skip-chatzilla --skip-comm --skip-inspector --tinderbox-print"'
     ]
 
 for platform in ['linux32', 'linux64', 'macosx-universal']:
     whitelist['nightly'][platform] += [
         'mk_add_options MOZ_MAKE_FLAGS="-j4"',
     ]

--- a/browser/config/mozconfigs/win32/debug
+++ b/browser/config/mozconfigs/win32/debug
@@ -14,14 +14,14 @@ export MOZILLA_OFFICIAL=1
 # Enable Telemetry
 export MOZ_TELEMETRY_REPORTING=1
 
 . $topsrcdir/build/win32/mozconfig.vs-latest
 
 # Package js shell.
 export MOZ_PACKAGE_JSSHELL=1
 
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --with-branding=browser/branding/nightly
 
 . "$topsrcdir/build/mozconfig.rust"
 
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/win32/l10n-mozconfig
+++ b/browser/config/mozconfigs/win32/l10n-mozconfig
@@ -1,14 +1,14 @@
 . "$topsrcdir/browser/config/mozconfigs/common"
 
 ac_add_options --enable-update-channel=${MOZ_UPDATE_CHANNEL}
 ac_add_options --with-l10n-base=../../l10n
 ac_add_options --with-windows-version=603
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --enable-official-branding
 
 export MOZILLA_OFFICIAL=1
 
 # Enable Telemetry
 export MOZ_TELEMETRY_REPORTING=1
 
 # Don't autoclobber l10n, as this can lead to missing binaries and broken builds
 # Bug 1283438

--- a/browser/config/mozconfigs/win32/nightly
+++ b/browser/config/mozconfigs/win32/nightly
@@ -1,12 +1,12 @@
 . "$topsrcdir/build/mozconfig.win-common"
 . "$topsrcdir/browser/config/mozconfigs/win32/common-opt"
 
 
 ac_add_options --enable-verify-mar
 
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --with-branding=browser/branding/nightly
 
 . "$topsrcdir/build/mozconfig.rust"
 
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/win64/debug
+++ b/browser/config/mozconfigs/win64/debug
@@ -14,16 +14,16 @@ ac_add_options --enable-verify-mar
 export MOZILLA_OFFICIAL=1
 
 # Enable Telemetry
 export MOZ_TELEMETRY_REPORTING=1
 
 # Package js shell.
 export MOZ_PACKAGE_JSSHELL=1
 
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --with-branding=browser/branding/nightly
 
 . $topsrcdir/build/win64/mozconfig.vs-latest
 
 . "$topsrcdir/build/mozconfig.rust"
 
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/mozconfigs/win64/l10n-mozconfig
+++ b/browser/config/mozconfigs/win64/l10n-mozconfig
@@ -1,15 +1,15 @@
 . "$topsrcdir/browser/config/mozconfigs/common"
 . "$topsrcdir/browser/config/mozconfigs/win64/common-win64"
 
 ac_add_options --enable-update-channel=${MOZ_UPDATE_CHANNEL}
 ac_add_options --with-l10n-base=../../l10n
 ac_add_options --with-windows-version=603
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --enable-official-branding
 
 export MOZILLA_OFFICIAL=1
 
 # Enable Telemetry
 export MOZ_TELEMETRY_REPORTING=1
 
 # Don't autoclobber l10n, as this can lead to missing binaries and broken builds
 # Bug 1283438

--- a/browser/config/mozconfigs/win64/nightly
+++ b/browser/config/mozconfigs/win64/nightly
@@ -1,13 +1,13 @@
 . "$topsrcdir/build/mozconfig.win-common"
 . "$topsrcdir/browser/config/mozconfigs/win64/common-win64"
 . "$topsrcdir/browser/config/mozconfigs/win64/common-opt"
 
 
 ac_add_options --enable-verify-mar
 
-ac_add_options --with-branding=browser/branding/aurora
+ac_add_options --with-branding=browser/branding/nightly
 
 . "$topsrcdir/build/mozconfig.rust"
 
 . "$topsrcdir/build/mozconfig.common.override"
 . "$topsrcdir/build/mozconfig.cache"

--- a/browser/config/version.txt
+++ b/browser/config/version.txt
@@ -1,1 +1,1 @@
-52.0a2
+52.0

--- a/browser/config/version_display.txt
+++ b/browser/config/version_display.txt
@@ -1,1 +1,1 @@
-52.0a2
+52.0b1

--- a/browser/confvars.sh
+++ b/browser/confvars.sh
@@ -42,19 +42,19 @@ MOZ_EXTENSIONS_DEFAULT=" gio"
 # "unofficial" branding.
 # For the mozilla-aurora repository, use "aurora".
 MOZ_BRANDING_DIRECTORY=browser/branding/unofficial
 MOZ_OFFICIAL_BRANDING_DIRECTORY=browser/branding/official
 MOZ_APP_ID={ec8030f7-c20a-464f-9b0e-13a3a9e97384}
 # This should usually be the same as the value MAR_CHANNEL_ID.
 # If more than one ID is needed, then you should use a comma separated list
 # of values.
-ACCEPTED_MAR_CHANNEL_IDS=firefox-mozilla-aurora
+ACCEPTED_MAR_CHANNEL_IDS=firefox-mozilla-beta,firefox-mozilla-release
 # The MAR_CHANNEL_ID must not contain the following 3 characters: ",\t "
-MAR_CHANNEL_ID=firefox-mozilla-aurora
+MAR_CHANNEL_ID=firefox-mozilla-beta
 MOZ_PROFILE_MIGRATOR=1
 MOZ_APP_STATIC_INI=1
 MOZ_WEBGL_CONFORMANT=1
 MOZ_JSDOWNLOADS=1
 MOZ_RUST_MP4PARSE=1
 MOZ_RUST_URLPARSE=1
 
 # Enable checking that add-ons are signed by the trusted root

--- a/build/mozconfig.common
+++ b/build/mozconfig.common
@@ -13,14 +13,14 @@
 mk_add_options AUTOCLOBBER=1
 
 ac_add_options --enable-crashreporter
 
 ac_add_options --enable-release
 
 # Enable checking that add-ons are signed by the trusted root
 MOZ_ADDON_SIGNING=${MOZ_ADDON_SIGNING-1}
-# Disable enforcing that add-ons are signed by the trusted root
-MOZ_REQUIRE_SIGNING=${MOZ_REQUIRE_SIGNING-0}
+# Enable enforcing that add-ons are signed by the trusted root
+MOZ_REQUIRE_SIGNING=${MOZ_REQUIRE_SIGNING-1}
 
 ac_add_options --enable-js-shell
 
 . "$topsrcdir/build/mozconfig.automation"

--- a/config/milestone.txt
+++ b/config/milestone.txt
@@ -5,9 +5,9 @@
 #    x.x.x.x
 #    x.x.x+
 #
 # Referenced by milestone.py.
 # Hopefully I'll be able to automate replacement of *all*
 # hardcoded milestones in the tree from these two files.
 #--------------------------------------------------------
 
-52.0a2
+52.0

--- a/mobile/android/config/mozconfigs/android-api-15/debug
+++ b/mobile/android/config/mozconfigs/android-api-15/debug
@@ -6,11 +6,11 @@ ENABLE_MARIONETTE=1
 
 # Android
 ac_add_options --with-android-min-sdk=15
 ac_add_options --target=arm-linux-androideabi
 
 export MOZILLA_OFFICIAL=1
 export MOZ_TELEMETRY_REPORTING=1
 
-ac_add_options --with-branding=mobile/android/branding/aurora
+ac_add_options --with-branding=mobile/android/branding/beta
 
 . "$topsrcdir/mobile/android/config/mozconfigs/common.override"

--- a/mobile/android/config/mozconfigs/android-api-15/l10n-nightly
+++ b/mobile/android/config/mozconfigs/android-api-15/l10n-nightly
@@ -11,17 +11,17 @@ ac_add_options --with-android-min-sdk=15
 ac_add_options --target=arm-linux-androideabi
 
 ac_add_options --with-system-zlib
 ac_add_options --enable-updater
 ac_add_options --enable-update-channel=${MOZ_UPDATE_CHANNEL}
 
 export MOZILLA_OFFICIAL=1
 
-ac_add_options --with-branding=mobile/android/branding/aurora
+ac_add_options --with-branding=mobile/android/branding/beta
 
 ac_add_options --disable-stdcxx-compat
 
 # Don't autoclobber l10n, as this can lead to missing binaries and broken builds
 # Bug 1283438
 mk_add_options AUTOCLOBBER=
 
 . "$topsrcdir/mobile/android/config/mozconfigs/common.override"

--- a/mobile/android/config/mozconfigs/android-api-15/nightly
+++ b/mobile/android/config/mozconfigs/android-api-15/nightly
@@ -1,17 +1,17 @@
 . "$topsrcdir/mobile/android/config/mozconfigs/common"
 
 
 
 # Android
 ac_add_options --with-android-min-sdk=15
 ac_add_options --target=arm-linux-androideabi
 
-ac_add_options --with-branding=mobile/android/branding/aurora
+ac_add_options --with-branding=mobile/android/branding/beta
 
 # This will overwrite the default of stripping everything and keep the symbol table.
 # This is useful for profiling with eideticker. See bug 788680
 STRIP_FLAGS="--strip-debug"
 
 export MOZILLA_OFFICIAL=1
 export MOZ_TELEMETRY_REPORTING=1
 

--- a/mobile/android/config/mozconfigs/android-x86/debug
+++ b/mobile/android/config/mozconfigs/android-x86/debug
@@ -5,11 +5,11 @@ ac_add_options --enable-debug
 
 # Android
 ac_add_options --target=i386-linux-android
 ac_add_options --with-android-min-sdk=15
 
 export MOZILLA_OFFICIAL=1
 export MOZ_TELEMETRY_REPORTING=1
 
-ac_add_options --with-branding=mobile/android/branding/aurora
+ac_add_options --with-branding=mobile/android/branding/beta
 
 . "$topsrcdir/mobile/android/config/mozconfigs/common.override"

--- a/mobile/android/config/mozconfigs/android-x86/l10n-nightly
+++ b/mobile/android/config/mozconfigs/android-x86/l10n-nightly
@@ -10,17 +10,17 @@ ac_add_options --disable-tests
 ac_add_options --target=i386-linux-android
 ac_add_options --with-android-min-sdk=15
 
 ac_add_options --enable-updater
 ac_add_options --enable-update-channel=${MOZ_UPDATE_CHANNEL}
 
 export MOZILLA_OFFICIAL=1
 
-ac_add_options --with-branding=mobile/android/branding/aurora
+ac_add_options --with-branding=mobile/android/branding/beta
 
 ac_add_options --disable-stdcxx-compat
 
 # Don't autoclobber l10n, as this can lead to missing binaries and broken builds
 # Bug 1283438
 mk_add_options AUTOCLOBBER=
 
 . "$topsrcdir/mobile/android/config/mozconfigs/common.override"

--- a/mobile/android/config/mozconfigs/android-x86/nightly
+++ b/mobile/android/config/mozconfigs/android-x86/nightly
@@ -1,16 +1,16 @@
 . "$topsrcdir/mobile/android/config/mozconfigs/common"
 
 ac_add_options --target=i386-linux-android
 ac_add_options --with-android-min-sdk=15
 
 
 
-ac_add_options --with-branding=mobile/android/branding/aurora
+ac_add_options --with-branding=mobile/android/branding/beta
 
 # This will overwrite the default of stripping everything and keep the symbol table.
 # This is useful for profiling with eideticker. See bug 788680
 STRIP_FLAGS="--strip-debug"
 
 export MOZILLA_OFFICIAL=1
 export MOZ_TELEMETRY_REPORTING=1