diff --git a/testing/firefox/build b/testing/firefox/build
index acd7a710..cfd4d6ce 100755
--- a/testing/firefox/build
+++ b/testing/firefox/build
@@ -14,6 +14,9 @@
 
 export PATH="$PWD/autoconf/bin:$PATH"
 
+# Ensure that MOZ_TELEMETRY_REPORTING is unset.
+unset MOZ_TELEMETRY_REPORTING
+
 # shellcheck disable=SC2164
 cd firefox
 
diff --git a/testing/firefox/checksums b/testing/firefox/checksums
index a121ea85..0d2e94ac 100644
--- a/testing/firefox/checksums
+++ b/testing/firefox/checksums
@@ -1,7 +1,7 @@
 6037f77bdab29d79ca5e3fbd1d32f6c209e09d2066189a13dc7f7491227f5568  firefox-68.0.1.source.tar.xz
 f0611136bee505811e9ca11ca7ac188ef5323a8e2ef19cffd3edb3cf08fd791e  autoconf-2.13.tar.gz
 8355ff012e7380f9eec70f8e2c02d256f097943438c9cfba968cd06401c443df  user.js
-1101fb886314a9ccb84c0250cdccef8653c9794a2e44a243f6a82f55df508eb2  mozconfig
+3453caeb2a560be2d2e3f1c8bab8281fa62419a09f19221d09cf055d11900ae0  mozconfig
 960d82bbfdc88c95f5cb4f2e1c1bf23dae7519b3b7203914d7b3ddbff1ba4c28  stab.h
 315880530f09175788dfa48a1915bfa1e190bfd3e267988b9100cb93006c808c  fix-fortify-system-wrappers.patch
 026e778105ed4921d61b6f9935a861b7e9ba9ac8cc44d8516883c3b5bd7590c4  fix-musl.patch
diff --git a/testing/firefox/files/mozconfig b/testing/firefox/files/mozconfig
index 3435b7a7..b6b0ba8b 100644
--- a/testing/firefox/files/mozconfig
+++ b/testing/firefox/files/mozconfig
@@ -33,7 +33,6 @@ ac_add_options --disable-startup-notification
 
 # Respect the user's privacy.
 export MOZ_SERVICES_METRICS=0
-export MOZ_TELEMETRY_REPORTING=0
 export MOZ_PAY=0
 export MOZ_SERVICES_HEALTHREPORTER=0
 export MOZ_SERVICES_FXACCOUNTS=0
@@ -43,7 +42,6 @@ export MOZ_DEVICES=0
 ac_add_options --disable-crashreporter
 ac_add_options --disable-updater
 ac_add_options --disable-dbus
-ac_add_options --disable-maintenance-service
 ac_add_options --disable-eme
 ac_add_options --disable-necko-wifi
 ac_add_options --disable-webrtc