diff --git a/mozilla/layout/generic/nsFrame.cpp b/mozilla/layout/generic/nsFrame.cpp
index d1fac274114..1618d3d2d8d 100644
--- a/mozilla/layout/generic/nsFrame.cpp
+++ b/mozilla/layout/generic/nsFrame.cpp
@@ -5463,10 +5463,15 @@ GetCorrectedParent(nsPresContext* aPresContext, nsIFrame* aFrame,
   if (!parent) {
     *aSpecialParent = nsnull;
   } else {
-    *aSpecialParent =
-      nsFrame::CorrectStyleParentFrame(parent,
-                                       aFrame->GetStyleContext()->
-                                         GetPseudoType());
+    nsIAtom* pseudo = aFrame->GetStyleContext()->GetPseudoType();
+    // Outer tables are always anon boxes; if we're in here for an outer
+    // table, that actually means its the _inner_ table that wants to
+    // know its parent.  So get the pseudo of the inner in that case.
+    if (pseudo == nsCSSAnonBoxes::tableOuter) {
+      pseudo =
+        aFrame->GetFirstChild(nsnull)->GetStyleContext()->GetPseudoType();
+    }
+    *aSpecialParent = nsFrame::CorrectStyleParentFrame(parent, pseudo);
   }
 
   return NS_OK;
diff --git a/mozilla/layout/reftests/bugs/377603-1-ref.html b/mozilla/layout/reftests/bugs/377603-1-ref.html
new file mode 100644
index 00000000000..a87cdb7891d
--- /dev/null
+++ b/mozilla/layout/reftests/bugs/377603-1-ref.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <head>
+    <style>
+      table table
+        { border-collapse: collapse; border-style: solid; border-width: 10px;
+          border-color: green }
+    </style>
+  </head>
+</head>
+<body>
+<table><tr>
+  <td>
+    <table>
+      <tr><td></td></tr>
+    </table>    
+    <table>
+      <tr><td></td></tr>
+    </table>
+  </td>
+</tr></table>
+</body>
+</html>
diff --git a/mozilla/layout/reftests/bugs/377603-1.html b/mozilla/layout/reftests/bugs/377603-1.html
new file mode 100644
index 00000000000..e45672e5ebe
--- /dev/null
+++ b/mozilla/layout/reftests/bugs/377603-1.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <head>
+    <style>
+      table table
+        { border-collapse: collapse; border-style: solid; border-width: 10px }
+    </style>
+  </head>
+</head>
+<body>
+<table><tr>
+  <td style="border: 0px solid green; color: red">
+    <table style="border-color: inherit">
+      <tr><td></td></tr>
+    </table>    
+    <table id="test">
+      <tr><td></td></tr>
+    </table>
+    <script>
+      document.body.offsetWidth;
+      document.getElementById("test").style.borderColor = "inherit";
+    </script>
+  </td>
+</tr></table>
+</body>
+</html>
diff --git a/mozilla/layout/reftests/bugs/reftest.list b/mozilla/layout/reftests/bugs/reftest.list
index a84d2ab7e9a..42a3c52f484 100644
--- a/mozilla/layout/reftests/bugs/reftest.list
+++ b/mozilla/layout/reftests/bugs/reftest.list
@@ -216,3 +216,4 @@ fails-if(MOZ_WIDGET_TOOLKIT=="cocoa") == 372037-1.html 372037-1-ref.html # bug 3
 == 374038-2.xul 374038-2-ref.xul
 == 374193-1.xhtml about:blank
 fails == 376484-1.html 376484-1-ref.html
+== 377603-1.html 377603-1-ref.html
