changes.diff

diff --git a/toolkit/components/uniffi-js/UniFFIPointer.cpp b/toolkit/components/uniffi-js/UniFFIPointer.cpp
index b77ef853957a7..edc6f69d90c28 100644
--- a/toolkit/components/uniffi-js/UniFFIPointer.cpp
+++ b/toolkit/components/uniffi-js/UniFFIPointer.cpp
@@ -81,6 +82,11 @@ void UniFFIPointer::Write(const ArrayBuffer& aArrayBuff, uint32_t aPosition,
         // in Rust and Read(), a u64 is read as BigEndian and then converted to
         // a pointer we do the reverse here
         const auto& data_ptr = aData.Subspan(aPosition, 8);
+        // The hazard checker assumes all calls to a function pointer may result in a GC call and
+        // `ClonePtr` calls mType->clone. However, we know that mtype->clone won't make a GC call
+        // since it's essentially just a call to Rust's `Arc::clone()`. Use AutoSuppressGCAnalysis
+        // to tell the hazard checker to ignore the call.
+        JS::AutoSuppressGCAnalysis suppress;
         mozilla::BigEndian::writeUint64(data_ptr.Elements(),
                                         (uint64_t)ClonePtr());
         return true;