diff --git a/app/src/firefoxBeta/AndroidManifest.xml b/app/src/firefoxBeta/AndroidManifest.xml
new file mode 100644
index 0000000000..4f63281517
--- /dev/null
+++ b/app/src/firefoxBeta/AndroidManifest.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  sharedUserId: This flavor is meant to replace Firefox (Beta channel) and therefore needs to inherit
+                its sharedUserId for all eternity. Shipping an app update without sharedUserId can have
+                fatal consequences. For example see:
+                - https://issuetracker.google.com/issues/36924841
+                - https://issuetracker.google.com/issues/36905922
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      android:sharedUserId="org.mozilla.firefox.sharedID">
+</manifest>
diff --git a/app/src/firefoxNightly/AndroidManifest.xml b/app/src/firefoxNightly/AndroidManifest.xml
new file mode 100644
index 0000000000..b108579eb6
--- /dev/null
+++ b/app/src/firefoxNightly/AndroidManifest.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  sharedUserId: This flavor is meant to replace Firefox (Nightly channel) and therefore needs to inherit
+                its sharedUserId for all eternity. Shipping an app update without sharedUserId can have
+                fatal consequences. For example see:
+                - https://issuetracker.google.com/issues/36924841
+                - https://issuetracker.google.com/issues/36905922
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      android:sharedUserId="org.mozilla.fennec.sharedID">
+</manifest>
diff --git a/app/src/firefoxRelease/AndroidManifest.xml b/app/src/firefoxRelease/AndroidManifest.xml
new file mode 100644
index 0000000000..46a1c91bb8
--- /dev/null
+++ b/app/src/firefoxRelease/AndroidManifest.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  sharedUserId: This flavor is meant to replace Firefox (Release channel) and therefore needs to inherit
+                its sharedUserId for all eternity. Shipping an app update without sharedUserId can have
+                fatal consequences. For example see:
+                - https://issuetracker.google.com/issues/36924841
+                - https://issuetracker.google.com/issues/36905922
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+      android:sharedUserId="org.mozilla.firefox.sharedID">
+</manifest>