diff --git a/toolkit/components/aboutmemory/tests/test_memoryReporters.xul b/toolkit/components/aboutmemory/tests/test_memoryReporters.xul
index 2b71260ce60..efaf8ded068 100644
--- a/toolkit/components/aboutmemory/tests/test_memoryReporters.xul
+++ b/toolkit/components/aboutmemory/tests/test_memoryReporters.xul
@@ -52,6 +52,26 @@
   let isImagesPresent = false;
   let isXptiWorkingSetPresent = false;
   let isAtomTablePresent = false;
+  let isBigStringPresent = false;
+  let isSmallString1Present = false;
+  let isSmallString2Present = false;
+
+  // Generate a long, random string.  We'll check that this string is
+  // reported in at least one of the memory reporters.
+  let bigString = "";
+  while (bigString.length < 10000) {
+    bigString += Math.random();
+  }
+  let bigStringPrefix = bigString.substring(0, 100);
+
+  // Generate many copies of two distinctive short strings, "!)(*&" and
+  // "@)(*&".  We'll check that these strings are reported in at least
+  // one of the memory reporters.
+  let shortStrings = [];
+  for (let i = 0; i < 10000; i++) {
+    let str = (Math.random() > 0.5 ? "!" : "@") + ")(*&";
+    shortStrings.push(str);
+  }
 
   let mySandbox = Components.utils.Sandbox(document.nodePrincipal,
                     { sandboxName: "this-is-a-sandbox-name" });
@@ -87,6 +107,12 @@
       // A system compartment with a location (such as a sandbox) should
       // show that location.
       isSandboxLocationShown = true;
+    } else if (aPath.contains(bigStringPrefix)) {
+      isBigStringPresent = true;
+    } else if (aPath.contains("!)(*&")) {
+      isSmallString1Present = true;
+    } else if (aPath.contains("@)(*&")) {
+      isSmallString2Present = true;
     }
   }
 
@@ -148,6 +174,9 @@
   ok(isImagesPresent,                       "images is present");
   ok(isXptiWorkingSetPresent,               "xpti-working-set is present");
   ok(isAtomTablePresent,                    "atom-table is present");
+  ok(isBigStringPresent,                    "large string is present");
+  ok(isSmallString1Present,                 "small string 1 is present");
+  ok(isSmallString2Present,                 "small string 2 is present");
 
   ]]>
   </script>