diff --git a/platform/safari/vapi-background.js b/platform/safari/vapi-background.js
index cd59db4399582..a106ce26c9502 100644
--- a/platform/safari/vapi-background.js
+++ b/platform/safari/vapi-background.js
@@ -1088,18 +1088,14 @@
                 vAPI.tabs.onNavigation({
                     url: e.message.url,
                     frameId: 0,
-                    tabId: vAPI.tabs.getTabId(e.target)
+                    tabId: vAPI.tabs.getTabId(e.target).toString()
                 });
                 e.message.hostname = µb.URI.hostnameFromURI(e.message.url);
                 e.message.tabId = vAPI.tabs.getTabId(e.target);
                 e.message.responseHeaders = [];
                 onBeforeRequestClient(e.message);
                 var blockVerdict = onHeadersReceivedClient(e.message);
-                if(blockVerdict && blockVerdict.responseHeaders) {
-                    e.message = false;
-                } else {
-                    e.message = true;
-                }
+                e.message.shouldBlock = blockVerdict && blockVerdict.responseHeaders;
                 return;
             }
             switch(e.message.type) {
@@ -1107,13 +1103,14 @@
                     var openerTabId = vAPI.tabs.getTabId(e.target).toString();
                     var shouldBlock = !!vAPI.tabs.onPopupUpdated("preempt", openerTabId, e.message.url);
                     if (shouldBlock) {
-                        e.message = false;
+                        e.message.shouldBlock = true;
                     } else {
                         vAPI.tabs.popupCandidate = openerTabId;
-                        e.message = true;
+                        e.message.shouldBlock = false;
                     }
                     break;
                 case "popstate":
+                    // No return value/message
                     vAPI.tabs.onUpdated(vAPI.tabs.getTabId(e.target), {
                         url: e.message.url
                     }, {
@@ -1124,13 +1121,9 @@
                     e.message.hostname = µb.URI.hostnameFromURI(e.message.url);
                     e.message.tabId = vAPI.tabs.getTabId(e.target);
                     var blockVerdict = onBeforeRequestClient(e.message);
-                    if(blockVerdict && blockVerdict.cancel) {
-                        e.message = false;
-                        return;
-                    } else {
-                        e.message = true;
-                        return;
-                    }
+                    e.message.response = blockVerdict;
+                    e.message.shouldBlock = blockVerdict && (blockVerdict.cancel === true || blockVerdict.redirectUrl !== undefined);
+                    return;
             }
         };
         safari.application.addEventListener("message", onBeforeRequestAdapter, true);
diff --git a/platform/safari/vapi-client.js b/platform/safari/vapi-client.js
index d972852d3594d..4dd9b474602f1 100644
--- a/platform/safari/vapi-client.js
+++ b/platform/safari/vapi-client.js
@@ -506,10 +506,10 @@
     // Inform that we've navigated
     var shouldBlockScript = false;
     if(frameId === 0) {
-        shouldBlockScript = !safari.self.tab.canLoad(beforeLoadEvent, {
+        shouldBlockScript = safari.self.tab.canLoad(beforeLoadEvent, {
             url: location.href,
             type: "main_frame"
-        });
+        }).shouldBlock;
     }
     var nodeTypes = {
         "frame": "sub_frame",
@@ -527,7 +527,10 @@
         details.frameId = frameId;
         details.parentFrameId = parentFrameId;
         details.timeStamp = Date.now();
-        return !(safari.self.tab.canLoad(beforeLoadEvent, details));
+        return safari.self.tab.canLoad(beforeLoadEvent, details).shouldBlock;
+    };
+    var redirectSrc = function(element, url) {
+        element.src = url;
     };
     var onBeforeLoad = function(e) {
         if(firstMutation !== false) {
@@ -537,16 +540,30 @@
         if(linkHelper.protocol.charCodeAt(0) !== 104) { // h = 104
             return;
         }
+        var type = nodeTypes[e.target.nodeName.toLowerCase()] || "other";
         var details = {
             url: linkHelper.href,
-            type: nodeTypes[e.target.nodeName.toLowerCase()] || "other",
+            type: type,
             // tabId is determined in the background script
             frameId: frameId,
             parentFrameId: parentFrameId,
             timeStamp: Date.now()
         };
         var response = safari.self.tab.canLoad(e, details);
-        if(response === false) {
+        // sometimes response = details, so check for that
+        if (response.shouldBlock) {
+            response = response.response.redirectUrl;
+            if (response) {
+                switch (type) {
+                    case 'style':
+                        e.target.href = response;
+                        break;
+                    case 'script':
+                    default:
+                        setTimeout(redirectSrc.bind(undefined, e.target, response), 1);
+                        break;
+                }
+            }
             e.preventDefault();
         }
     };
@@ -599,7 +616,8 @@ set: function(val) {\
 x.setAttribute('src', block(val, 'image') ? 'data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=' : val);\
 }\
 });\
-}\catch(e){}\
+}\
+catch(e){}\
 return x;\
 };\
 open = function(u) {\