diff --git a/app/build.sh.orig b/app/build.sh
index 649d629..642ce81 100755
--- a/app/build.sh.orig
+++ b/app/build.sh
@@ -59,10 +59,7 @@ function abspath {
 }
 
 function check_lfs_file {
-	if [ "$(head --bytes 5 "$1")" = "versi" ]; then
-		echo "$1 not checked out -- install Git LFS and run 'git lfs pull'" >&2
-		exit 1
-	fi
+	return 0
 }
 
 SOURCE_DIR=""
@@ -840,18 +837,13 @@ if [ $BUILD_LINUX == 1 ]; then
 		cp -r "$runtime_path/"!(application.ini|browser|defaults|devtools-files|crashreporter|crashreporter.ini|firefox|pingsender|precomplete|removed-files|run-mozilla.sh|update-settings.ini|updater|updater.ini) "$APPDIR"
 		
 		# Use our own launcher that calls the original Firefox executable with -app
-		mv "$APPDIR"/firefox-bin "$APPDIR"/zotero-bin
+		mv "$APPDIR"/firefox-esr "$APPDIR"/zotero-bin
 		cp "$CALLDIR/linux/zotero" "$APPDIR"/zotero
 		
 		# Copy Ubuntu launcher files
 		cp "$CALLDIR/linux/zotero.desktop" "$APPDIR"
 		cp "$CALLDIR/linux/set_launcher_icon" "$APPDIR"
 		
-		# Use our own updater, because Mozilla's requires updates signed by Mozilla
-		check_lfs_file "$CALLDIR/linux/updater.tar.xz"
-		tar xf "$CALLDIR/linux/updater.tar.xz" --to-stdout updater-$arch > "$APPDIR/updater"
-		chmod 755 "$APPDIR/updater"
-
 		# Copy app files
 		rsync -a "$base_dir/" "$APPDIR/"
 		
@@ -860,6 +852,7 @@ if [ $BUILD_LINUX == 1 ]; then
 		cp -RH "$CALLDIR/modules/zotero-libreoffice-integration/install" "$APPDIR/integration/libreoffice"
 		
 		# Copy icons
+		mkdir -p "$APPDIR"/icons
 		cp "$CALLDIR/linux/icons/icon128.png" "$APPDIR/icons/"
 		cp "$CALLDIR/linux/icons/symbolic.svg" "$APPDIR/icons/"