gecko-dev/toolkit/library/gecko.natvis

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    <DisplayString>size = {mHdr-&gt;mLength}, capacity = {mHdr-&gt;mCapacity}</DisplayString>
    <Expand>
      <ArrayItems Condition="mHdr->mLength &gt; 0">
	<Size>mHdr-&gt;mLength</Size>
	<ValuePointer>($T1*)(mHdr + 1)</ValuePointer>
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  <!-- refcounts -->
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    <DisplayString>{mValue}</DisplayString>
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  <Type Name="nsCycleCollectingAutoRefCnt">
    <!-- this value needs to be updated if NS_NUMBER_OF_FLAGS_IN_REFCNT in xpcom/glue/nsISupportsImpl.h changes -->
    <DisplayString>{mValue >> 2}</DisplayString>
    <Expand>
      <Synthetic Name="In Purple Buffer"><DisplayString>{mValue &amp; 1 != 0}</DisplayString></Synthetic>
      <Synthetic Name="Is Purple"><DisplayString>{mValue &amp; 2 != 0}</DisplayString></Synthetic>
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  <Type Name="mozilla::ThreadSafeAutoRefCnt">
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    <AlternativeType Name="nsCOMPtr&lt;*&gt;" />
    <AlternativeType Name="nsAutoPtr&lt;*&gt;" />
    <AlternativeType Name="mozilla::WebGLRefPtr&lt;*&gt;" />

    <DisplayString Condition="mRawPtr == 0">NULL</DisplayString>
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    <AlternativeType Name="mozilla::detail::nsTStringRepr&lt;char&gt;" />
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    <StringView>mData,su</StringView>
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  <Type Name="nsTSubstringTuple&lt;char16_t&gt;">
    <DisplayString Condition="mHead != nullptr">{mHead,na} {mFragB-&gt;mData,su}</DisplayString>
    <DisplayString Condition="mHead == nullptr">{mFragA-&gt;mData,su} {mFragB-&gt;mData,su}</DisplayString>
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    <DisplayString>x={x}, y={y}, width={width}, height={height}</DisplayString>
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    <AlternativeType Name="nsIntSize" />
    <DisplayString>width={width}, height={height}</DisplayString>
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    <AlternativeType Name="mozilla::gfx::Point" />
    <DisplayString>x={x}, y={y}</DisplayString>
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  <Type Name="mozilla::gfx::Matrix4x4">
    <AlternativeType Name="gfx3DMatrix" />
    <DisplayString Condition="(_11==_22==_33==_44==1) &amp;&amp; (_12==_13==_14==_21==_23==_24==_31==_32==_34==_41==_42==_43==0)">[Identity]</DisplayString>
    <DisplayString Condition="(_11==_22==_33==_44==1) &amp;&amp; (_12==_13==_14==_21==_23==_24==_31==_32==_34==0)">[Translate: ({_41}, {_42}, {_43})]</DisplayString>
    <DisplayString Condition="_44==1 &amp;&amp; (_12==_13==_14==_21==_23==_24==_31==_32==_34==_41==_42==_43==0)">[Scale: ({_11}, {_22}, {_33})]</DisplayString>
    <DisplayString>[4x4 Matrix]</DisplayString>

    <Expand>
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      <Synthetic Name="R2"><DisplayString>[{_21}, {_22}, {_23}, {_24}]</DisplayString></Synthetic>
      <Synthetic Name="R3"><DisplayString>[{_31}, {_32}, {_33}, {_34}]</DisplayString></Synthetic>
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  <!-- JS types -->
  <Type Name="JS::Handle&lt;*&gt;">
    <DisplayString Condition="ptr == 0">NULL</DisplayString>
    <DisplayString>{*($T1*)ptr}</DisplayString>
    <Expand>
      <ExpandedItem>($T1*)ptr</ExpandedItem>
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