diff --git a/assets/patches.txt b/assets/patches.txt
index 34af6b1..bb101f6 100644
--- a/assets/patches.txt
+++ b/assets/patches.txt
@@ -4,6 +4,7 @@ patches/bootstrap-without-vcs.patch
 patches/context-menu.patch
 patches/custom-ubo-assets-bootstrap-location.patch
 patches/disable-data-reporting-at-compile-time.patch
+patches/faster-package-multi-locale.patch
 patches/hide-passwordmgr.patch
 patches/librewolf-pref-pane.patch
 patches/mozilla_dirs.patch
diff --git a/patches/faster-package-multi-locale.patch b/patches/faster-package-multi-locale.patch
new file mode 100644
index 0000000..880d1c7
--- /dev/null
+++ b/patches/faster-package-multi-locale.patch
@@ -0,0 +1,91 @@
+diff --git a/python/mozbuild/mozbuild/mach_commands.py b/python/mozbuild/mozbuild/mach_commands.py
+--- a/python/mozbuild/mozbuild/mach_commands.py
++++ b/python/mozbuild/mozbuild/mach_commands.py
+@@ -2468,11 +2468,11 @@
+ @CommandArgument(
+     "--locales",
+     metavar="LOCALES",
+     nargs="+",
+     required=True,
+-    help='List of locales to package, including "en-US"',
++    help='List of locales to package, excluding "en-US"',
+ )
+ @CommandArgument(
+     "--verbose", action="store_true", help="Log informative status messages."
+ )
+ def package_l10n(command_context, verbose=False, locales=[]):
+@@ -2484,55 +2484,36 @@
+             "export BUILD_BACKENDS=FasterMake,RecursiveMake\n"
+             "in your mozconfig."
+         )
+         return 1
+ 
+-    if "en-US" not in locales:
+-        command_context.log(
+-            logging.WARN,
+-            "package-multi-locale",
+-            {"locales": locales},
+-            'List of locales does not include default locale "en-US": '
+-            '{locales}; adding "en-US"',
+-        )
+-        locales.append("en-US")
+-    locales = list(sorted(locales))
++    locales = list(filter(lambda locale: locale != "en-US", sorted(locales)))
+ 
+     append_env = {
+         # We are only (re-)packaging, we don't want to (re-)build
+         # anything inside Gradle.
+         "GRADLE_INVOKED_WITHIN_MACH_BUILD": "1",
+         "MOZ_CHROME_MULTILOCALE": " ".join(locales),
+     }
+ 
+-    for locale in locales:
+-        if locale == "en-US":
+-            command_context.log(
+-                logging.INFO,
+-                "package-multi-locale",
+-                {"locale": locale},
+-                "Skipping default locale {locale}",
+-            )
+-            continue
+-
+-        command_context.log(
+-            logging.INFO,
+-            "package-multi-locale",
+-            {"locale": locale},
+-            "Processing chrome Gecko resources for locale {locale}",
+-        )
+-        command_context.run_process(
+-            [
+-                mozpath.join(command_context.topsrcdir, "mach"),
+-                "build",
+-                "chrome-{}".format(locale),
+-            ],
+-            append_env=append_env,
+-            pass_thru=True,
+-            ensure_exit_code=True,
+-            cwd=mozpath.join(command_context.topsrcdir),
+-        )
++    command_context.log(
++        logging.INFO,
++        "package-multi-locale",
++        {"locales": locales},
++        "Processing chrome Gecko resources for locales {locales}",
++    )
++    command_context.run_process(
++        [
++            mozpath.join(command_context.topsrcdir, "mach"),
++            "build",
++            " ".join(map(lambda locale: "chrome-{}".format(locale), locales)),
++        ],
++        append_env=append_env,
++        pass_thru=True,
++        ensure_exit_code=True,
++        cwd=mozpath.join(command_context.topsrcdir),
++    )
+ 
+     if command_context.substs["MOZ_BUILD_APP"] == "mobile/android":
+         command_context.log(
+             logging.INFO,
+             "package-multi-locale",
+