diff --git a/configure.in b/configure.in
index 4f0967538b7..aedfd392a0c 100644
--- a/configure.in
+++ b/configure.in
@@ -3758,7 +3758,6 @@ MOZ_SCTP=
 MOZ_ANDROID_OMX=
 MOZ_MEDIA_NAVIGATOR=
 MOZ_OMX_PLUGIN=
-MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE=
 MOZ_VPX_ERROR_CONCEALMENT=
 MOZ_WEBSPEECH=1
 MOZ_WEBSPEECH_MODELS=
@@ -5367,26 +5366,8 @@ if test -n "$MOZ_OMX_PLUGIN"; then
         dnl Only allow building OMX plugin on Gonk (B2G) or Android
         AC_DEFINE(MOZ_OMX_PLUGIN)
     else
-        dnl fail if we're not building on Gonk or Android
-        AC_MSG_ERROR([OMX media plugin can only be built on B2G or Android])
-    fi
-fi
-
-dnl ========================================================
-dnl = Enable building mobile/android with Gradle
-dnl ========================================================
-MOZ_ARG_ENABLE_BOOL(gradle-mobile-android-builds,
-[  --enable-gradle-mobile-android-builds      Enable building mobile/android with Gradle],
-    MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE=1,
-    MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE=)
-
-if test -n "$MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE"; then
-    if test "$OS_TARGET" = "Android" -a x"$MOZ_WIDGET_TOOLKIT" != x"gonk"; then
-        dnl Only allow building mobile/android with Gradle.
-        AC_DEFINE(MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE)
-    else
-        dnl fail if we're not building mobile/android.
-        AC_MSG_ERROR([Can only build mobile/android with Gradle])
+       dnl fail if we're not building on Gonk or Android
+       AC_MSG_ERROR([OMX media plugin can only be built on B2G or Android])
     fi
 fi
 
@@ -8926,7 +8907,6 @@ AC_SUBST(MOZ_DIRECTSHOW)
 AC_SUBST(MOZ_ANDROID_OMX)
 AC_SUBST(MOZ_APPLEMEDIA)
 AC_SUBST(MOZ_OMX_PLUGIN)
-AC_SUBST(MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE)
 AC_SUBST(MOZ_VPX_ERROR_CONCEALMENT)
 AC_SUBST(VPX_AS)
 AC_SUBST_LIST(VPX_ASFLAGS)
diff --git a/mobile/android/base/Makefile.in b/mobile/android/base/Makefile.in
index ee2843a5265..0a455191c09 100644
--- a/mobile/android/base/Makefile.in
+++ b/mobile/android/base/Makefile.in
@@ -2,12 +2,6 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-# We call mach -> Make -> gradle -> mach, which races to find and
-# create .mozconfig files and to generate targets.
-ifdef MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE
-.NOTPARALLEL:
-endif
-
 MOZ_BUILDID := $(shell cat $(DEPTH)/config/buildid)
 
 # Set the appropriate version code, based on the existance of the
@@ -207,21 +201,9 @@ endif # MOZ_INSTALL_TRACKING
 
 library_jars := $(subst $(NULL) ,:,$(strip $(library_jars)))
 
-gradle_dir := $(topobjdir)/gradle/build/mobile/android
-
-ifdef MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE
-.gradle.deps: .aapt.deps FORCE
-	@$(TOUCH) $@
-	$(topsrcdir)/mach gradle --no-daemon --offline app:dexAutomationDebug app:assembleAutomationDebugAndroidTest -x lint
-
-classes.dex: .gradle.deps
-	$(REPORT_BUILD)
-	cp $(gradle_dir)/app/intermediates/dex/automation/debug/classes.dex $@
-else
 classes.dex: .proguard.deps
 	$(REPORT_BUILD)
 	$(DX) --dex --output=classes.dex jars-proguarded
-endif
 
 ifdef MOZ_DISABLE_PROGUARD
   PROGUARD_PASSES=0
@@ -519,13 +501,8 @@ endef
 # .aapt.deps: $(all_resources)
 $(eval $(call aapt_command,.aapt.deps,$(all_resources),gecko.ap_,generated/,./))
 
-ifdef MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE
-.aapt.nodeps: FORCE
-	cp $(gradle_dir)/app/intermediates/res/resources-automation-debug.ap_ gecko-nodeps.ap_
-else
-# .aapt.nodeps: $(CURDIR)/AndroidManifest.xml FORCE
-$(eval $(call aapt_command,.aapt.nodeps,$(CURDIR)/AndroidManifest.xml FORCE,gecko-nodeps.ap_,gecko-nodeps/,gecko-nodeps/))
-endif
+# .aapt.nodeps: $(abspath $(CURDIR)/AndroidManifest.xml) FORCE
+$(eval $(call aapt_command,.aapt.nodeps,$(abspath $(CURDIR)/AndroidManifest.xml) FORCE,gecko-nodeps.ap_,gecko-nodeps/,gecko-nodeps/))
 
 # Override the Java settings with some specific android settings
 include $(topsrcdir)/config/android-common.mk
@@ -555,14 +532,7 @@ gradle-targets: $(foreach f,$(constants_PP_JAVAFILES),$(f))
 gradle-targets: $(abspath AndroidManifest.xml)
 gradle-targets: $(ANDROID_GENERATED_RESFILES)
 
-ifndef MOZILLA_OFFICIAL
-# Local developers update omni.ja during their builds.  There's a
-# chicken-and-egg problem here.
-gradle-omnijar: $(abspath $(DIST)/fennec/$(OMNIJAR_NAME))
-else
-# In automation, omni.ja is built only during packaging.
-gradle-omnijar:
-endif
+gradle-omnijar: $(ABS_DIST)/fennec/$(OMNIJAR_NAME)
 
 .PHONY: gradle-targets gradle-omnijar
 
@@ -573,8 +543,8 @@ endif
 
 # GeneratedJNIWrappers.cpp target also generates
 # GeneratedJNIWrappers.h and GeneratedJNINatives.h
-ifndef MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE
-libs:: jni-stubs.inc GeneratedJNIWrappers.cpp
+libs:: classes.dex jni-stubs.inc GeneratedJNIWrappers.cpp $(CURDIR)/fennec_ids.txt
+	$(INSTALL) classes.dex $(FINAL_TARGET)
 	@(diff jni-stubs.inc $(topsrcdir)/mozglue/android/jni-stubs.inc >/dev/null && \
 	  diff GeneratedJNIWrappers.cpp $(topsrcdir)/widget/android/GeneratedJNIWrappers.cpp >/dev/null && \
 	  diff GeneratedJNIWrappers.h $(topsrcdir)/widget/android/GeneratedJNIWrappers.h >/dev/null && \
@@ -588,9 +558,3 @@ libs:: jni-stubs.inc GeneratedJNIWrappers.cpp
 	  echo '* Repeat the build, and check in any changes.       *' && \
 	  echo '*****************************************************' && \
 	  exit 1)
-endif
-
-libs:: $(CURDIR)/fennec_ids.txt
-
-libs:: classes.dex
-	$(INSTALL) classes.dex $(FINAL_TARGET)
diff --git a/mobile/android/mach_commands.py b/mobile/android/mach_commands.py
index 11cafbdcbbb..329ca25e502 100644
--- a/mobile/android/mach_commands.py
+++ b/mobile/android/mach_commands.py
@@ -21,6 +21,16 @@ from mach.decorators import (
     Command,
 )
 
+SUCCESS = '''
+You should be ready to build with Gradle and import into IntelliJ!  Test with
+
+    ./mach gradle build
+
+and in IntelliJ select File > Import project... and choose
+
+    {topobjdir}/mobile/android/gradle
+'''
+
 
 # NOTE python/mach/mach/commands/commandinfo.py references this function
 #      by name. If this function is renamed or removed, that file should
diff --git a/mobile/android/moz.build b/mobile/android/moz.build
index d7d6eb6f2af..049293ed682 100644
--- a/mobile/android/moz.build
+++ b/mobile/android/moz.build
@@ -31,9 +31,8 @@ if CONFIG['MOZ_ANDROID_PACKAGE_INSTALL_BOUNCER']:
 
 DIRS += ['../../xulrunner/tools/redit']
 
-if not CONFIG['MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE']:
-    TEST_DIRS += [
-        'tests',
-    ]
+TEST_DIRS += [
+    'tests',
+]
 
 SPHINX_TREES['fennec'] = 'docs'
diff --git a/python/mozbuild/mozbuild/mozconfig.py b/python/mozbuild/mozbuild/mozconfig.py
index a60b79774dd..2e829422d8d 100644
--- a/python/mozbuild/mozbuild/mozconfig.py
+++ b/python/mozbuild/mozbuild/mozconfig.py
@@ -107,7 +107,7 @@ class MozconfigLoader(ProcessExecutionMixin):
         if 'MOZ_MYCONFIG' in env:
             raise MozconfigFindException(MOZ_MYCONFIG_ERROR)
 
-        env_path = env.get('MOZCONFIG', None) or None
+        env_path = env.get('MOZCONFIG', None)
         if env_path is not None:
             if not os.path.isabs(env_path):
                 potential_roots = [self.topsrcdir, os.getcwd()]
diff --git a/testing/instrumentation/Makefile.in b/testing/instrumentation/Makefile.in
index 0ccb15a2c8f..6b1c225c87b 100644
--- a/testing/instrumentation/Makefile.in
+++ b/testing/instrumentation/Makefile.in
@@ -14,12 +14,10 @@ include $(topsrcdir)/config/android-common.mk
 
 stage-package:
 	$(NSINSTALL) -D $(_DEST_DIR)
-ifndef MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE
 	$(call RELEASE_SIGN_ANDROID_APK,\
 		$(DEPTH)/mobile/android/tests/background/junit3/background-junit3-debug-unsigned-unaligned.apk,\
 		$(_DEST_DIR)/background-junit3.apk)
 	$(call RELEASE_SIGN_ANDROID_APK,\
 		$(DEPTH)/mobile/android/tests/browser/junit3/browser-junit3-debug-unsigned-unaligned.apk,\
 		$(_DEST_DIR)/browser-junit3.apk)
-endif
 	@(cd $(DEPTH)/_tests/ && tar $(TAR_CREATE_FLAGS) - instrumentation) | (cd $(PKG_STAGE) && tar -xf -)
diff --git a/testing/mochitest/Makefile.in b/testing/mochitest/Makefile.in
index a0448dcd7bb..e4eedf120bf 100644
--- a/testing/mochitest/Makefile.in
+++ b/testing/mochitest/Makefile.in
@@ -107,15 +107,11 @@ $(_DEST_DIR):
 ifeq ($(MOZ_BUILD_APP),mobile/android)
 include $(topsrcdir)/config/android-common.mk
 
-ifndef MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE
-robocop_apk := $(topobjdir)/mobile/android/tests/browser/robocop/robocop-debug-unsigned-unaligned.apk
-else
-robocop_apk := $(topobjdir)/gradle/build/mobile/android/app/outputs/apk/app-automation-debug-androidTest-unaligned.apk
-endif
-
 stage-package-android:
 	$(NSINSTALL) -D $(_DEST_DIR)
-	$(call RELEASE_SIGN_ANDROID_APK,$(robocop_apk),$(_DEST_DIR)/robocop.apk)
+	$(call RELEASE_SIGN_ANDROID_APK,\
+		$(DEPTH)/mobile/android/tests/browser/robocop/robocop-debug-unsigned-unaligned.apk,\
+		$(_DEST_DIR)/robocop.apk)
 
 stage-package: stage-package-android
 endif
diff --git a/toolkit/mozapps/installer/upload-files.mk b/toolkit/mozapps/installer/upload-files.mk
index d4297fa3fd8..9cfe53c11c3 100644
--- a/toolkit/mozapps/installer/upload-files.mk
+++ b/toolkit/mozapps/installer/upload-files.mk
@@ -325,18 +325,13 @@ UPLOAD_EXTRA_FILES += geckoview_library/geckoview_assets.zip
 # Robocop/Robotium tests, Android Background tests, and Fennec need to
 # be signed with the same key, which means release signing them all.
 
-ifndef MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE
-robocop_apk := $(topobjdir)/mobile/android/tests/browser/robocop/robocop-debug-unsigned-unaligned.apk
-else
-robocop_apk := $(topobjdir)/gradle/build/mobile/android/app/outputs/apk/app-automation-debug-androidTest-unaligned.apk
-endif
-
+ROBOCOP_PATH = $(topobjdir)/mobile/android/tests/browser/robocop
 # Normally, $(NSINSTALL) would be used instead of cp, but INNER_ROBOCOP_PACKAGE
 # is used in a series of commands that run under a "cd something", while
 # $(NSINSTALL) is relative.
 INNER_ROBOCOP_PACKAGE= \
   cp $(GECKO_APP_AP_PATH)/fennec_ids.txt $(ABS_DIST) && \
-  $(call RELEASE_SIGN_ANDROID_APK,$(robocop_apk),$(ABS_DIST)/robocop.apk)
+  $(call RELEASE_SIGN_ANDROID_APK,$(ROBOCOP_PATH)/robocop-debug-unsigned-unaligned.apk,$(ABS_DIST)/robocop.apk)
 endif
 else
 INNER_ROBOCOP_PACKAGE=echo 'Testing is disabled - No Android Robocop for you'
@@ -475,15 +470,6 @@ PKG_SUFFIX = .apk
 INNER_SZIP_LIBRARIES = \
   $(if $(ALREADY_SZIPPED),,$(foreach lib,$(SZIP_LIBRARIES),host/bin/szip $(MOZ_SZIP_FLAGS) $(STAGEPATH)$(MOZ_PKG_DIR)$(_BINPATH)/$(lib) && )) true
 
-ifdef MOZ_BUILD_MOBILE_ANDROID_WITH_GRADLE
-INNER_CHECK_R_TXT=echo 'No R.txt checking for you!'
-else
-INNER_CHECK_R_TXT=\
-  ((test ! -f $(GECKO_APP_AP_PATH)/R.txt && echo "*** Warning: The R.txt that is being packaged might not agree with the R.txt that was built. This is normal during l10n repacks.") || \
-    diff $(GECKO_APP_AP_PATH)/R.txt $(GECKO_APP_AP_PATH)/gecko-nodeps/R.txt >/dev/null || \
-    (echo "*** Error: The R.txt that was built and the R.txt that is being packaged are not the same. Rebuild mobile/android/base and re-package." && exit 1))
-endif
-
 # Insert $(STAGEPATH)$(MOZ_PKG_DIR)$(_BINPATH)/classes.dex into
 # $(ABS_DIST)/gecko.ap_, producing $(ABS_DIST)/gecko.apk.
 INNER_MAKE_APK = \
@@ -504,11 +490,13 @@ INNER_MAKE_APK = \
   $(ZIPALIGN) -f -v 4 $(ABS_DIST)/gecko.apk $(PACKAGE)
 
 ifeq ($(MOZ_BUILD_APP),mobile/android)
-INNER_MAKE_PACKAGE = \
+INNER_MAKE_PACKAGE	= \
   $(INNER_SZIP_LIBRARIES) && \
   make -C $(GECKO_APP_AP_PATH) gecko-nodeps.ap_ && \
   cp $(GECKO_APP_AP_PATH)/gecko-nodeps.ap_ $(ABS_DIST)/gecko.ap_ && \
-  $(INNER_CHECK_R_TXT) && \
+  ( (test ! -f $(GECKO_APP_AP_PATH)/R.txt && echo "*** Warning: The R.txt that is being packaged might not agree with the R.txt that was built. This is normal during l10n repacks.") || \
+    diff $(GECKO_APP_AP_PATH)/R.txt $(GECKO_APP_AP_PATH)/gecko-nodeps/R.txt >/dev/null || \
+    (echo "*** Error: The R.txt that was built and the R.txt that is being packaged are not the same. Rebuild mobile/android/base and re-package." && exit 1)) && \
   $(INNER_MAKE_APK) && \
   $(INNER_ROBOCOP_PACKAGE) && \
   $(INNER_INSTALL_BOUNCER_PACKAGE) && \
@@ -517,7 +505,7 @@ INNER_MAKE_PACKAGE = \
 endif
 
 ifeq ($(MOZ_BUILD_APP),mobile/android/b2gdroid)
-INNER_MAKE_PACKAGE = \
+INNER_MAKE_PACKAGE	= \
   $(INNER_SZIP_LIBRARIES) && \
   cp $(topobjdir)/mobile/android/b2gdroid/app/classes.dex $(ABS_DIST)/classes.dex && \
   cp $(topobjdir)/mobile/android/b2gdroid/app/b2gdroid-unsigned-unaligned.apk $(ABS_DIST)/gecko.ap_ && \