diff --git a/srcpkgs/firefox-esr/template b/srcpkgs/firefox-esr/template
index 8dc5ae3ac79..92f655dbab2 100644
--- a/srcpkgs/firefox-esr/template
+++ b/srcpkgs/firefox-esr/template
@@ -1,7 +1,7 @@
 # Template build file for 'firefox-esr'.
 pkgname=firefox-esr
 version=45.9.0
-revision=2
+revision=3
 wrksrc="firefox-${version}esr"
 short_desc="Lightweight gecko-based web browser"
 maintainer="Eivind Uggedal <eivind@uggedal.com>"
@@ -50,8 +50,12 @@ pre_configure() {
 
 	# Google API key (see http://www.chromium.org/developers/how-tos/api-keys)
 	# Note: This is for Void Linux use ONLY.
-	_google_api_key="AIzaSyCIFdBA7eQP43R6kXRwTq7j6Mvj1ITze90"
-	echo -n "$_google_api_key" > google-api-key
+	echo -n "AIzaSyCIFdBA7eQP43R6kXRwTq7j6Mvj1ITze90" > google-api-key
+
+	# Mozilla API keys (see https://location.services.mozilla.com/api)
+	# Note: This is for Void Linux use ONLY.
+	echo -n "cd894504-7a2a-4263-abff-ff73ee89ffca" > mozilla-api-key
+
 	[ ! -d xbps-build ] && mkdir -p xbps-build
 }
 do_configure() {
@@ -116,6 +120,7 @@ do_configure() {
 		--with-nspr-prefix=${XBPS_CROSS_BASE}/usr \
 		--with-nss-prefix=${XBPS_CROSS_BASE}/usr \
 		--with-google-api-keyfile="${wrksrc}/google-api-key" \
+		--with-mozilla-api-keyfile="${wrksrc}/mozilla-api-key" \
 		--enable-optimize="$CFLAGS" --disable-strip --disable-install-strip \
 		--disable-static --enable-pie --disable-profiling \
 		--disable-profilelocking ${_args}