[Centaury] Apply libjar improvements.

application/basilisk/confvars.sh

@@ -53,3 +53,9 @@ if test "$OS_ARCH" = "WINNT" -o \
         "$OS_ARCH" = "Darwin"; then
   MOZ_CAN_DRAW_IN_TITLEBAR=1
 fi
+
+# Set the chrome packing format
+# Possible values are omni, jar, and flat
+# Currently, only omni and flat are supported
+MOZ_CHROME_FILE_FORMAT=omni
+JAR_COMPRESSION=brotli