diff --git a/src/raven.js b/src/raven.js
index e5f8780c3a4e..01cd5fe85281 100644
--- a/src/raven.js
+++ b/src/raven.js
@@ -21,7 +21,8 @@ var _Raven = window.Raven,
         tags: {},
         extra: {}
     },
-    authQueryString;
+    authQueryString,
+    isRavenInstalled = false;
 
 /*
  * The core Raven singleton
@@ -52,6 +53,10 @@ var Raven = {
      * @return {Raven}
      */
     config: function(dsn, options) {
+        if (globalServer) {
+            logDebug('error', 'Error: Raven has already been configured');
+            return Raven;
+        }
         if (!dsn) return Raven;
 
         var uri = parseDSN(dsn),
@@ -117,8 +122,9 @@ var Raven = {
      * @return {Raven}
      */
     install: function() {
-        if (isSetup()) {
+        if (isSetup() && !isRavenInstalled) {
             TraceKit.report.subscribe(handleStackInfo);
+            isRavenInstalled = true;
         }
 
         return Raven;
@@ -212,6 +218,7 @@ var Raven = {
      */
     uninstall: function() {
         TraceKit.report.uninstall();
+        isRavenInstalled = false;
 
         return Raven;
     },
@@ -681,9 +688,7 @@ function makeRequest(data) {
 function isSetup() {
     if (!hasJSON) return false;  // needs JSON support
     if (!globalServer) {
-        if (window.console && console.error && Raven.debug) {
-            console.error("Error: Raven has not been configured.");
-        }
+        logDebug('error', 'Error: Raven has not been configured.');
         return false;
     }
     return true;
@@ -720,6 +725,12 @@ function uuid4() {
     });
 }
 
+function logDebug(level, message) {
+    if (window.console && console[level] && Raven.debug) {
+        console[level](message);
+    }
+}
+
 function afterLoad() {
     // Attempt to initialize Raven on load
     var RavenConfig = window.RavenConfig;
diff --git a/test/raven.test.js b/test/raven.test.js
index 74b43777dbf7..ca352e4d4bda 100644
--- a/test/raven.test.js
+++ b/test/raven.test.js
@@ -218,31 +218,32 @@ describe('globals', function() {
         it('should return false when Raven is not configured', function() {
             hasJSON = true;    // be explicit
             globalServer = undefined;
-            this.sinon.stub(console, 'error');
+            this.sinon.stub(window, 'logDebug');
             assert.isFalse(isSetup());
         });
 
-        it('should not write to console.error when Raven is not configured and Raven.debug is false', function() {
-            hasJSON = true;    // be explicit
-            globalServer = undefined;
-            Raven.debug = false;
-            this.sinon.stub(console, 'error');
-            isSetup();
-            assert.isFalse(console.error.calledOnce);
+        it('should return true when everything is all gravy', function() {
+            hasJSON = true;
+            assert.isTrue(isSetup());
         });
+    });
 
-        it('should write to console.error when Raven is not configured and Raven.debug is true', function() {
-            hasJSON = true;    // be explicit
-            globalServer = undefined;
-            Raven.debug = true;
-            this.sinon.stub(console, 'error');
-            isSetup();
-            assert.isTrue(console.error.calledOnce);
+    describe('logDebug', function() {
+        var level = 'error',
+            message = 'foobar';
+
+        it('should not write to console when Raven.debug is false', function() {
+            Raven.debug = false;
+            this.sinon.stub(console, level);
+            logDebug(level, message);
+            assert.isFalse(console[level].called);
         });
 
-        it('should return true when everything is all gravy', function() {
-            hasJSON = true;
-            assert.isTrue(isSetup());
+        it('should write to console when Raven.debug is true', function() {
+            Raven.debug = true;
+            this.sinon.stub(console, level);
+            logDebug(level, message);
+            assert.isTrue(console[level].calledOnce);
         });
     });
 
@@ -1168,6 +1169,15 @@ describe('Raven (public API)', function() {
             assert.equal(Raven.config(''), Raven);
         });
 
+        it('should not set global options more than once', function() {
+            this.sinon.spy(window, 'parseDSN');
+            this.sinon.stub(window, 'logDebug');
+            setupRaven();
+            setupRaven();
+            assert.isTrue(parseDSN.calledOnce);
+            assert.isTrue(logDebug.called);
+        });
+
         describe('whitelistUrls', function() {
             it('should be false if none are passed', function() {
                 Raven.config('//abc@example.com/2');
@@ -1237,6 +1247,14 @@ describe('Raven (public API)', function() {
             assert.isTrue(TraceKit.report.subscribe.calledOnce);
             assert.equal(TraceKit.report.subscribe.lastCall.args[0], handleStackInfo);
         });
+
+        it('should not register itself more than once', function() {
+            this.sinon.stub(window, 'isSetup').returns(true);
+            this.sinon.stub(TraceKit.report, 'subscribe');
+            Raven.install();
+            Raven.install();
+            assert.isTrue(TraceKit.report.subscribe.calledOnce);
+        });
     });
 
     describe('.wrap', function() {
@@ -1382,6 +1400,13 @@ describe('Raven (public API)', function() {
             Raven.uninstall();
             assert.isTrue(TraceKit.report.uninstall.calledOnce);
         });
+
+        it('should set isRavenInstalled flag to false', function() {
+            isRavenInstalled = true;
+            this.sinon.stub(TraceKit.report, 'uninstall');
+            Raven.uninstall();
+            assert.isFalse(isRavenInstalled);
+        });
     });
 
     describe('.setUserContext', function() {