diff --git a/www/firefox-esr/files/patch-rust-1.70.0 b/www/firefox-esr/files/patch-rust-1.70.0
new file mode 100644
index 000000000000..233e51bee164
--- /dev/null
+++ b/www/firefox-esr/files/patch-rust-1.70.0
@@ -0,0 +1,33 @@
+https://github.com/mozilla/mp4parse-rust/commit/8b5b652d38e007e736bb442ccd5aa5ed699db100
+
+From 8b5b652d38e007e736bb442ccd5aa5ed699db100 Mon Sep 17 00:00:00 2001
+From: Matthew Gregan <kinetik@flim.org>
+Date: Thu, 16 Jun 2022 13:54:02 +1200
+Subject: [PATCH] Fix `unstable-name-collisions` warning by using fully
+ qualified path.
+
+---
+ mp4parse/src/lib.rs | 9 +++++++--
+ 1 file changed, 7 insertions(+), 2 deletions(-)
+
+diff --git a/mp4parse/src/lib.rs b/mp4parse/src/lib.rs
+index 567ee21d..4f3d7153 100644
+--- third_party/rust/mp4parse/src/lib.rs
++++ third_party/rust/mp4parse/src/lib.rs
+@@ -3506,8 +3506,13 @@ macro_rules! impl_mul {
+             type Output = $output;
+ 
+             fn mul(self, rhs: $rhs) -> Self::Output {
+-                static_assertions::const_assert!(<$output>::MAX <= <$inner>::MAX as u64);
+-                static_assertions::const_assert!(<$lhs>::MAX * <$rhs>::MAX <= <$output>::MAX);
++                static_assertions::const_assert!(
++                    <$output as UpperBounded>::MAX <= <$inner>::MAX as u64
++                );
++                static_assertions::const_assert!(
++                    <$lhs as UpperBounded>::MAX * <$rhs as UpperBounded>::MAX
++                        <= <$output as UpperBounded>::MAX
++                );
+ 
+                 let lhs: $inner = self.get().into();
+                 let rhs: $inner = rhs.get().into();
+