--- a/layout/style/nsComputedDOMStyle.cpp
+++ b/layout/style/nsComputedDOMStyle.cpp
@@ -955,26 +955,27 @@ nsComputedDOMStyle::UpdateCurrentStyleSo
       mStyleContext = styleIfVisited;
     }
   }
 }
 
 void
 nsComputedDOMStyle::ClearCurrentStyleSources()
 {
+  // Release the current style context if we got it off the frame.
+  // For a style context we resolved, keep it around so that we
+  // can re-use it next time this object is queried, but not if it-s a
+  // re-resolved style context because we were inside a pseudo-element.
+  if (!mResolvedStyleContext || mOuterFrame) {
+    ClearStyleContext();
+  }
+
   mOuterFrame = nullptr;
   mInnerFrame = nullptr;
   mPresShell = nullptr;
-
-  // Release the current style context if we got it off the frame.
-  // For a style context we resolved, keep it around so that we
-  // can re-use it next time this object is queried.
-  if (!mResolvedStyleContext) {
-    mStyleContext = nullptr;
-  }
 }
 
 already_AddRefed<CSSValue>
 nsComputedDOMStyle::GetPropertyCSSValue(const nsAString& aPropertyName, ErrorResult& aRv)
 {
   nsCSSPropertyID prop =
     nsCSSProps::LookupProperty(aPropertyName, CSSEnabledState::eForAllContent);