diff --git a/mobile/android/base/tests/JavascriptTest.java b/mobile/android/base/tests/JavascriptTest.java
index d692a71ff431..77a98388414f 100644
--- a/mobile/android/base/tests/JavascriptTest.java
+++ b/mobile/android/base/tests/JavascriptTest.java
@@ -37,7 +37,8 @@ public class JavascriptTest extends BaseTest {
         mAsserter.dumpLog("Loading JavaScript test from " + url);
         loadUrl(url);
 
-        final JavascriptMessageParser testMessageParser = new JavascriptMessageParser(mAsserter);
+        final JavascriptMessageParser testMessageParser =
+                new JavascriptMessageParser(mAsserter, false);
         try {
             while (!testMessageParser.isTestFinished()) {
                 if (Log.isLoggable(LOGTAG, Log.VERBOSE)) {
diff --git a/mobile/android/base/tests/helpers/JavascriptBridge.java b/mobile/android/base/tests/helpers/JavascriptBridge.java
index 6a6d9302014e..aa6299e1e4ac 100644
--- a/mobile/android/base/tests/helpers/JavascriptBridge.java
+++ b/mobile/android/base/tests/helpers/JavascriptBridge.java
@@ -110,8 +110,10 @@ public final class JavascriptBridge {
     public JavascriptBridge(final Object target) {
         mTarget = target;
         mMethods = target.getClass().getMethods();
-        mLogParser = new JavascriptMessageParser(sAsserter);
         mExpecter = sActions.expectGeckoEvent(EVENT_TYPE);
+        // The JS here is unrelated to a test harness, so we
+        // have our message parser end on assertion failure.
+        mLogParser = new JavascriptMessageParser(sAsserter, true);
     }
 
     /**
diff --git a/mobile/android/base/tests/helpers/JavascriptMessageParser.java b/mobile/android/base/tests/helpers/JavascriptMessageParser.java
index af48d4189d3d..6237f1adcf1a 100644
--- a/mobile/android/base/tests/helpers/JavascriptMessageParser.java
+++ b/mobile/android/base/tests/helpers/JavascriptMessageParser.java
@@ -34,9 +34,22 @@ public final class JavascriptMessageParser {
     private String lastTestName = "";
     // Have we seen a message saying the test is finished?
     private boolean testFinishedMessageSeen = false;
+    private final boolean endOnAssertionFailure;
 
-    public JavascriptMessageParser(final Assert asserter) {
+    /**
+     * Constructs a message parser for test result messages sent from JavaScript. When seeing an
+     * assertion failure, the message parser can use the given {@link org.mozilla.gecko.Assert}
+     * instance to immediately end the test (typically if the underlying JS framework is not able
+     * to end the test itself) or to swallow the Errors - this functionality is determined by the
+     * <code>endOnAssertionFailure</code> parameter.
+     *
+     * @param asserter The Assert instance to which test results should be passed.
+     * @param endOnAssertionFailure
+     *        true if the test should end if we see a JS assertion failure, false otherwise.
+     */
+    public JavascriptMessageParser(final Assert asserter, final boolean endOnAssertionFailure) {
         this.asserter = asserter;
+        this.endOnAssertionFailure = endOnAssertionFailure;
     }
 
     public boolean isTestFinished() {
@@ -61,8 +74,15 @@ public final class JavascriptMessageParser {
                 try {
                     asserter.ok(false, name, message);
                 } catch (AssertionFailedError e) {
-                    // Swallow this exception.  We want to see all the
-                    // Javascript failures, not die on the very first one!
+                    // Above, we call the assert, allowing it to log.
+                    // Now we can end the test, if applicable.
+                    if (this.endOnAssertionFailure) {
+                        throw e;
+                    }
+                    // Otherwise, swallow the Error. The JS framework we're
+                    // logging messages from is likely capable of ending tests
+                    // when it needs to, and we want to see all of its failures,
+                    // not just the first one!
                 }
             } else if ("KNOWN-FAIL".equals(type)) {
                 asserter.todo(false, name, message);