diff --git a/gfx/2d/DataSurfaceHelpers.cpp b/gfx/2d/DataSurfaceHelpers.cpp
index 99dfe063a3..c9a4945a25 100644
--- a/gfx/2d/DataSurfaceHelpers.cpp
+++ b/gfx/2d/DataSurfaceHelpers.cpp
@@ -84,8 +84,9 @@ DataAtOffset(DataSourceSurface* aSurface,
   MOZ_ASSERT(Factory::CheckSurfaceSize(aSurface->GetSize()),
              "surface size overflows - this should have been prevented when the surface was created");
 
-  uint8_t* data = aMap->mData + aPoint.y * aMap->mStride +
-    aPoint.x * BytesPerPixel(aSurface->GetFormat());
+  uint8_t* data = aMap->mData +
+                  size_t(aPoint.y) * size_t(aMap->mStride) +
+                  size_t(aPoint.x) * size_t(BytesPerPixel(aSurface->GetFormat()));
 
   if (data < aMap->mData) {
     MOZ_CRASH("GFX: out-of-range data access");
@@ -124,22 +125,29 @@ void
 CopySurfaceDataToPackedArray(uint8_t* aSrc, uint8_t* aDst, IntSize aSrcSize,
                              int32_t aSrcStride, int32_t aBytesPerPixel)
 {
-  MOZ_ASSERT(aBytesPerPixel > 0,
-             "Negative stride for aDst not currently supported");
-  MOZ_ASSERT(BufferSizeFromStrideAndHeight(aSrcStride, aSrcSize.height) > 0,
-             "How did we end up with a surface with such a big buffer?");
+  CheckedInt<size_t> packedStride(aBytesPerPixel);
+  packedStride *= aSrcSize.width;
+  if (!packedStride.isValid()) {
+    MOZ_ASSERT(false, "Invalid stride");
+    return;
+  }
 
-  int packedStride = aSrcSize.width * aBytesPerPixel;
+  CheckedInt<size_t> totalSize(aSrcStride);
+  totalSize *= aSrcSize.height;
+  if (!totalSize.isValid()) {
+    MOZ_ASSERT(false, "Invalid surface size");
+    return;
+  }
 
-  if (aSrcStride == packedStride) {
+  if (size_t(aSrcStride) == packedStride.value()) {
     // aSrc is already packed, so we can copy with a single memcpy.
-    memcpy(aDst, aSrc, packedStride * aSrcSize.height);
+    memcpy(aDst, aSrc, totalSize.value());
   } else {
     // memcpy one row at a time.
     for (int row = 0; row < aSrcSize.height; ++row) {
-      memcpy(aDst, aSrc, packedStride);
+      memcpy(aDst, aSrc, packedStride.value());
       aSrc += aSrcStride;
-      aDst += packedStride;
+      aDst += packedStride.value();
     }
   }
 }
diff --git a/js/src/jit/CodeGenerator.cpp b/js/src/jit/CodeGenerator.cpp
index 3f1b7251a3..78d39bfc52 100644
--- a/js/src/jit/CodeGenerator.cpp
+++ b/js/src/jit/CodeGenerator.cpp
@@ -3757,6 +3757,7 @@ CodeGenerator::visitCallNative(LCallNative* call)
         if (jitInfo && jitInfo->type() == JSJitInfo::IgnoresReturnValueNative)
             native = jitInfo->ignoresReturnValueMethod;
     }
+    ensureOsiSpace();
     masm.callWithABI(JS_FUNC_TO_DATA_PTR(void*, native));
 
     emitTracelogStopEvent(TraceLogger_Call);
@@ -3881,6 +3882,7 @@ CodeGenerator::visitCallDOMNative(LCallDOMNative* call)
     masm.passABIArg(argObj);
     masm.passABIArg(argPrivate);
     masm.passABIArg(argArgs);
+    ensureOsiSpace();
     masm.callWithABI(JS_FUNC_TO_DATA_PTR(void*, target->jitInfo()->method));
 
     if (target->jitInfo()->isInfallible) {
@@ -4006,6 +4008,7 @@ CodeGenerator::visitCallGeneric(LCallGeneric* call)
 
     // Finally call the function in objreg.
     masm.bind(&makeCall);
+    ensureOsiSpace();
     uint32_t callOffset = masm.callJit(objreg);
     markSafepointAt(callOffset, call);
 
@@ -4104,6 +4107,7 @@ CodeGenerator::visitCallKnown(LCallKnown* call)
     masm.Push(Imm32(descriptor));
 
     // Finally call the function in objreg.
+    ensureOsiSpace();
     uint32_t callOffset = masm.callJit(objreg);
     markSafepointAt(callOffset, call);
 
@@ -4436,6 +4440,7 @@ CodeGenerator::emitApplyGeneric(T* apply)
         masm.bind(&rejoin);
 
         // Finally call the function in objreg, as assigned by one of the paths above.
+        ensureOsiSpace();
         uint32_t callOffset = masm.callJit(objreg);
         markSafepointAt(callOffset, apply);
 
@@ -11244,6 +11249,7 @@ CodeGenerator::visitGetDOMProperty(LGetDOMProperty* ins)
     masm.passABIArg(ObjectReg);
     masm.passABIArg(PrivateReg);
     masm.passABIArg(ValueReg);
+    ensureOsiSpace();
     masm.callWithABI(JS_FUNC_TO_DATA_PTR(void*, ins->mir()->fun()));
 
     if (ins->mir()->isInfallible()) {
diff --git a/js/src/jit/shared/CodeGenerator-shared.cpp b/js/src/jit/shared/CodeGenerator-shared.cpp
index 08e9d311cf..16e082745c 100644
--- a/js/src/jit/shared/CodeGenerator-shared.cpp
+++ b/js/src/jit/shared/CodeGenerator-shared.cpp
@@ -1112,7 +1112,6 @@ CodeGeneratorShared::ensureOsiSpace()
     }
     MOZ_ASSERT_IF(!masm.oom(),
                   masm.currentOffset() - lastOsiPointOffset_ >= Assembler::PatchWrite_NearCallSize());
-    lastOsiPointOffset_ = masm.currentOffset();
 }
 
 uint32_t
@@ -1124,6 +1123,7 @@ CodeGeneratorShared::markOsiPoint(LOsiPoint* ins)
     uint32_t offset = masm.currentOffset();
     SnapshotOffset so = ins->snapshot()->snapshotOffset();
     masm.propagateOOM(osiIndices_.append(OsiIndex(offset, so)));
+    lastOsiPointOffset_ = offset;
 
     return offset;
 }
diff --git a/toolkit/mozapps/installer/packager-uxp.mk b/toolkit/mozapps/installer/packager-uxp.mk
index 856ca434c3..8d7cb4e62d 100644
--- a/toolkit/mozapps/installer/packager-uxp.mk
+++ b/toolkit/mozapps/installer/packager-uxp.mk
@@ -15,7 +15,6 @@ ifeq (,$(filter SunOS Linux WINNT,$(OS_ARCH)))
 else
 	$(MAKE) stage-package make-buildinfo-file
 	@echo 'Compressing...'
-	cd $(DIST)/$(MOZ_PKG_DIR); $(CREATE_PRECOMPLETE_CMD)
 ifeq (WINNT,$(OS_ARCH))
 	cd $(DIST); $(CYGWIN_WRAPPER) 7z a -t7z -m0=lzma2 -mx=9 -aoa -bb3 $(PKG_BASENAME).7z $(MOZ_PKG_DIR)
 else
diff --git a/toolkit/mozapps/installer/packager.mk b/toolkit/mozapps/installer/packager.mk
index 41a07cbfd5..394c480ffe 100644
--- a/toolkit/mozapps/installer/packager.mk
+++ b/toolkit/mozapps/installer/packager.mk
@@ -55,6 +55,10 @@ stage-package: $(MOZ_PKG_MANIFEST) $(MOZ_PKG_MANIFEST_DEPS)
 		$(MOZ_PKG_MANIFEST) '$(DIST)' '$(DIST)'/$(STAGEPATH)$(MOZ_PKG_DIR)$(if $(MOZ_PKG_MANIFEST),,$(_BINPATH)) \
 		$(if $(filter omni,$(MOZ_PACKAGER_FORMAT)),$(if $(NON_OMNIJAR_FILES),--non-resource $(NON_OMNIJAR_FILES)))
 	$(PYTHON) $(MOZILLA_DIR)/toolkit/mozapps/installer/find-dupes.py $(DIST)/$(STAGEPATH)$(MOZ_PKG_DIR)
+ifneq (Darwin, $(OS_ARCH))
+	# We don't want to do this on Mac as it will end up in the package root which is not how Mac packages things
+	cd $(DIST)/$(MOZ_PKG_DIR) && $(CREATE_PRECOMPLETE_CMD)
+endif
 ifdef MOZ_PACKAGE_JSSHELL
 	# Package JavaScript Shell
 	@echo 'Packaging JavaScript Shell...'