diff --git a/configure.in b/configure.in
index 36fb3ce0f5b1..76570897d894 100644
--- a/configure.in
+++ b/configure.in
@@ -3833,6 +3833,7 @@ MOZ_ANDROID_BEAM=
 MOZ_LOCALE_SWITCHER=
 MOZ_ANDROID_SEARCH_ACTIVITY=
 MOZ_ANDROID_MLS_STUMBLER=
+MOZ_ANDROID_SHARE_OVERLAY=
 ACCESSIBILITY=1
 MOZ_TIME_MANAGER=
 MOZ_PAY=
@@ -4855,6 +4856,13 @@ if test -n "$MOZ_ANDROID_MLS_STUMBLER"; then
     AC_DEFINE(MOZ_ANDROID_MLS_STUMBLER)
 fi
 
+dnl ========================================================
+dnl = Include share overlay on Android
+dnl ========================================================
+if test -n "$MOZ_ANDROID_SHARE_OVERLAY"; then
+    AC_DEFINE(MOZ_ANDROID_SHARE_OVERLAY)
+fi
+
 dnl ========================================================
 dnl = Enable IPDL's "expensive" unit tests
 dnl ========================================================
@@ -8447,6 +8455,7 @@ AC_SUBST(MOZ_ANDROID_BEAM)
 AC_SUBST(MOZ_LOCALE_SWITCHER)
 AC_SUBST(MOZ_DISABLE_GECKOVIEW)
 AC_SUBST(MOZ_ANDROID_SEARCH_ACTIVITY)
+AC_SUBST(MOZ_ANDROID_SHARE_OVERLAY)
 AC_SUBST(MOZ_ANDROID_MLS_STUMBLER)
 AC_SUBST(ENABLE_STRIP)
 AC_SUBST(PKG_SKIP_STRIP)
diff --git a/mobile/android/base/locales/moz.build b/mobile/android/base/locales/moz.build
index 6721a9538b17..704da121638f 100644
--- a/mobile/android/base/locales/moz.build
+++ b/mobile/android/base/locales/moz.build
@@ -6,3 +6,6 @@
 
 if CONFIG['MOZ_ANDROID_SEARCH_ACTIVITY']:
     DEFINES['MOZ_ANDROID_SEARCH_ACTIVITY'] = 1
+
+if CONFIG['MOZ_ANDROID_SHARE_OVERLAY']:
+    DEFINES['MOZ_ANDROID_SHARE_OVERLAY'] = 1
diff --git a/mobile/android/base/moz.build b/mobile/android/base/moz.build
index 9921e96c9aef..bd7a2c333ccc 100644
--- a/mobile/android/base/moz.build
+++ b/mobile/android/base/moz.build
@@ -587,7 +587,8 @@ ANDROID_GENERATED_RESFILES += [
 ]
 
 for var in ('MOZ_ANDROID_ANR_REPORTER', 'MOZ_LINKER_EXTRACT', 'MOZILLA_OFFICIAL', 'MOZ_DEBUG',
-            'MOZ_ANDROID_SEARCH_ACTIVITY', 'MOZ_NATIVE_DEVICES', 'MOZ_ANDROID_MLS_STUMBLER'):
+            'MOZ_ANDROID_SEARCH_ACTIVITY', 'MOZ_NATIVE_DEVICES', 'MOZ_ANDROID_MLS_STUMBLER',
+            'MOZ_ANDROID_SHARE_OVERLAY'):
     if CONFIG[var]:
         DEFINES[var] = 1
 
diff --git a/mobile/android/confvars.sh b/mobile/android/confvars.sh
index 515a6339fa2b..f7746f551773 100644
--- a/mobile/android/confvars.sh
+++ b/mobile/android/confvars.sh
@@ -81,5 +81,8 @@ else
   MOZ_ANDROID_SEARCH_ACTIVITY=
 fi
 
+# Don't enable the share overlay.
+# MOZ_ANDROID_SHARE_OVERLAY=1
+
 # Don't enable the Mozilla Location Service stumbler.
 # MOZ_ANDROID_MLS_STUMBLER=1