diff --git a/megazords/fenix-dylib/megazord_stub.c b/megazords/fenix-dylib/megazord_stub.c
new file mode 100644
index 0000000000..7b8ddba8ad
--- /dev/null
+++ b/megazords/fenix-dylib/megazord_stub.c
@@ -0,0 +1,56 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Types.h"
+
+// This seems sad?
+// If we could get a stub .rs we could use `tabs::uniffi_reexport_scaffolding!();` etc,
+// but here we are.
+// To get the symbols from our static lib we need to refer to a symbol from each crate within it.
+// This is an arbitrary choice - any symbol will do, but we chose these because every uniffi crate has it.
+extern int MOZ_EXPORT ffi_autofill_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_crashtest_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_fxa_client_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_init_rust_components_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_logins_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_merino_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_nimbus_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_places_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_push_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_remote_settings_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_rust_log_forwarder_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_search_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_suggest_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_sync15_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_sync_manager_uniffi_contract_version();
+extern int MOZ_EXPORT ffi_tabs_uniffi_contract_version();
+
+// far out, this is crazy - without this, only the search _NAMESPACE meta comes in,
+// meaning uniffi ends up generating a completely empty kotlin module for search.
+// Looking at `nm obj-dir/.../libsearch-*.rlib` you can see many symbols
+// are in a different .o - this symbol is one taken randomly from the .o with
+// the missing symbols, and they all happily come in.
+// W T A F.
+extern int MOZ_EXPORT uniffi_search_checksum_constructor_searchengineselector_new();
+
+void _local_megazord_dummy_symbol() {
+    ffi_autofill_uniffi_contract_version();
+    ffi_crashtest_uniffi_contract_version();
+    ffi_fxa_client_uniffi_contract_version();
+    ffi_init_rust_components_uniffi_contract_version();
+    ffi_logins_uniffi_contract_version();
+    ffi_merino_uniffi_contract_version();
+    ffi_nimbus_uniffi_contract_version();
+    ffi_places_uniffi_contract_version();
+    ffi_push_uniffi_contract_version();
+    ffi_remote_settings_uniffi_contract_version();
+    ffi_rust_log_forwarder_uniffi_contract_version();
+    ffi_search_uniffi_contract_version();
+    ffi_suggest_uniffi_contract_version();
+    ffi_sync15_uniffi_contract_version();
+    ffi_sync_manager_uniffi_contract_version();
+    ffi_tabs_uniffi_contract_version();
+    uniffi_search_checksum_constructor_searchengineselector_new();
+}
diff --git a/megazords/fenix-dylib/moz.build b/megazords/fenix-dylib/moz.build
new file mode 100644
index 0000000000..a17a1db367
--- /dev/null
+++ b/megazords/fenix-dylib/moz.build
@@ -0,0 +1,35 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# There are 2 parts to our megazord - a staticlib in megazords/full, then this
+# build file to create the final dyib .so
+# See the comments in megazords/full/moz.build.
+
+UNIFIED_SOURCES += [
+    "megazord_stub.c",
+]
+
+# This name confusion is a reflection of the 2 megazord parts. It should be
+# fixed after we land in m-c.
+SharedLibrary("megazord-so")
+SHARED_LIBRARY_NAME = "megazord"
+
+USE_LIBS += ["megazord", "mozpkix", "nspr"]
+
+# copy-pasta from other moz.build files.
+if CONFIG["MOZ_WIDGET_TOOLKIT"] == "cocoa":
+    OS_LIBS += ["-framework CoreFoundation"]
+elif CONFIG["OS_TARGET"] == "WINNT":
+    OS_LIBS += [
+        "advapi32",
+        "bcrypt",
+        "mswsock",
+        "ntdll",
+        "shell32",
+        "user32",
+        "userenv",
+        "wsock32",
+        "ws2_32",
+        "winmm",
+    ]
diff --git a/megazords/full/moz.build b/megazords/full/moz.build
new file mode 100644
index 0000000000..d4ebe0b834
--- /dev/null
+++ b/megazords/full/moz.build
@@ -0,0 +1,22 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Note that this crate, when used in app-services, directly creates the cdylib.
+# However, in moz-central it builds a staticlib. A new target in `../fenix-dylib`
+# takes this as a dep and creates the final cdylib.
+USE_LIBS += ["nss"]
+
+UNIFIED_SOURCES += [
+    "stub.cpp",
+]
+
+# This is the name of the .a file created.
+RustLibrary("megazord")
+
+# XXX - this doesn't really work - the tests fail due to missing `nss3`?
+RUST_TESTS = [
+    "megazord",
+]
diff --git a/megazords/full/src/lib.rs b/megazords/full/src/lib.rs
index 4b6ba44999..43eaed62f5 100644
--- a/megazords/full/src/lib.rs
+++ b/megazords/full/src/lib.rs
@@ -8,6 +8,7 @@
 use std::ffi::CString;
 use std::os::raw::c_char;
 
+// NOTE if you add or remove crates below here, please make a corresponding change in ../fenix-dylib/megazord_stub.c
 pub use autofill;
 pub use crashtest;
 pub use error_support;
@@ -26,6 +27,8 @@ pub use sync_manager;
 pub use tabs;
 pub use tracing_support;
 pub use viaduct;
+// NOTE if you add or remove crates above here, please make a corresponding change in ../fenix-dylib/megazord_stub.c
+
 // TODO: Uncomment this code when webext-storage component is integrated in android
 // pub use webext_storage;
 
diff --git a/megazords/full/stub.cpp b/megazords/full/stub.cpp
new file mode 100644
index 0000000000..bd20c15c4f
--- /dev/null
+++ b/megazords/full/stub.cpp
@@ -0,0 +1,8 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// This is an intentionally empty file. It is necessary for the build system to
+// successfully convert a static rust library into a dynamic library on
+// Windows.
diff --git a/moz.build b/moz.build
new file mode 100644
index 0000000000..cdc5e78c85
--- /dev/null
+++ b/moz.build
@@ -0,0 +1,34 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Note that this builds the cdylib for our megazord. See the comments
+# in megazords/full/moz.build.
+
+UNIFIED_SOURCES += [
+    "megazord_stub.c",
+]
+
+# This name confusion is a reflection of some of the above. It should be
+# fixed, but may be easier/better to fix once in m-c.
+SharedLibrary("megazord-so")
+SHARED_LIBRARY_NAME = "megazord"
+
+USE_LIBS += ["megazord", "mozpkix", "nspr"]
+
+# copy-pasta from other moz.build files, are these the correct checks?
+if CONFIG["MOZ_WIDGET_TOOLKIT"] == "cocoa":
+    OS_LIBS += ["-framework CoreFoundation"]
+elif CONFIG["OS_TARGET"] == "WINNT":
+    OS_LIBS += [
+        "advapi32",
+        "bcrypt",
+        "mswsock",
+        "ntdll",
+        "shell32",
+        "user32",
+        "userenv",
+        "wsock32",
+        "ws2_32",
+        "winmm",
+    ]
diff --git a/tools/embedded-uniffi-bindgen/Cargo.toml b/tools/embedded-uniffi-bindgen/Cargo.toml
index 8d008666fb..68a0c9bbea 100644
--- a/tools/embedded-uniffi-bindgen/Cargo.toml
+++ b/tools/embedded-uniffi-bindgen/Cargo.toml
@@ -5,5 +5,9 @@ authors = ["The Firefox Sync Developers <sync-team@mozilla.com>"]
 edition = "2021"
 license = "MPL-2.0"
 
+# A bin target needed when used in m-c.
+[[bin]]
+name = "embedded-uniffi-bindgen"
+
 [dependencies]
 uniffi = { version = "0.29.0", features = ["cli"] }
diff --git a/tools/embedded-uniffi-bindgen/moz.build b/tools/embedded-uniffi-bindgen/moz.build
new file mode 100644
index 0000000000..24201609d9
--- /dev/null
+++ b/tools/embedded-uniffi-bindgen/moz.build
@@ -0,0 +1,19 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+HOST_RUST_PROGRAMS = ["embedded-uniffi-bindgen"]
+
+# copy-pasta from other moz.build file.
+if CONFIG["MOZ_WIDGET_TOOLKIT"] == "cocoa":
+    OS_LIBS += ["-framework CoreFoundation"]
+elif CONFIG["OS_TARGET"] == "WINNT":
+    OS_LIBS += [
+        "advapi32",
+        "wsock32",
+        "ws2_32",
+        "mswsock",
+        "winmm",
+    ]