--- a/netwerk/protocol/http/nsHttpChannel.cpp
+++ b/netwerk/protocol/http/nsHttpChannel.cpp
@@ -1451,41 +1451,72 @@ EnsureMIMEOfScript(nsIURI* aURI, nsHttpR
     }
 
     if (aLoadInfo->GetExternalContentPolicyType() != nsIContentPolicy::TYPE_SCRIPT) {
         // if this is not a script load, then there is nothing to do
         return NS_OK;
     }
 
     nsAutoCString contentType;
+    nsCOMPtr<nsIURI> requestURI;
+    nsAutoCString requestURIString;
+    nsAutoCString responseURIString;
+    nsAutoCString corsOrigin;
+
     aResponseHead->ContentType(contentType);
     NS_ConvertUTF8toUTF16 typeString(contentType);
 
     if (nsContentUtils::IsJavascriptMIMEType(typeString)) {
         // script load has type script
-        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME::javaScript);
+        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::javaScript);
         return NS_OK;
     }
 
+    if (aLoadInfo->LoadingPrincipal()) {
+        aLoadInfo->LoadingPrincipal()->GetURI(getter_AddRefs(requestURI));
+        if (requestURI) {
+            requestURI->GetPrePath(requestURIString);
+        }
+        aURI->GetPrePath(responseURIString);
+        if (requestURIString.Equals(responseURIString)) {
+            //same origin
+            AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::same_origin);
+        } else {
+            bool cors = false;
+            nsresult rv = aResponseHead->GetHeader(nsHttp::ResolveAtom("Access-Control-Allow-Origin"), corsOrigin);
+            if (NS_SUCCEEDED(rv)) {
+                //cors origin
+                if (corsOrigin.Equals("*") || corsOrigin.Equals(requestURIString)) {
+                    AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::CORS_same_origin);
+                    cors = true;
+                }
+            }
+            if (!cors) {
+                //cross origin
+                AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::cross_origin);
+            }
+        }
+    }
+
     bool block = false;
     if (StringBeginsWith(contentType, NS_LITERAL_CSTRING("image/"))) {
         // script load has type image
-        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME::image);
+        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::image);
         block = true;
     } else if (StringBeginsWith(contentType, NS_LITERAL_CSTRING("audio/"))) {
         // script load has type audio
-        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME::audio);
+        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::audio);
         block = true;
     } else if (StringBeginsWith(contentType, NS_LITERAL_CSTRING("video/"))) {
         // script load has type video
-        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME::video);
+        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::video);
         block = true;
     } else if (StringBeginsWith(contentType, NS_LITERAL_CSTRING("text/csv"))) {
         // script load has type text/csv
-        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME::text_csv);
+        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::text_csv);
         block = true;
     }
 
     if (block) {
         // Instead of consulting Preferences::GetBool() all the time we
         // can cache the result to speed things up.
         static bool sCachedBlockScriptWithWrongMime = false;
         static bool sIsInited = false;
@@ -1501,52 +1532,52 @@ EnsureMIMEOfScript(nsIURI* aURI, nsHttpR
         }
 
         ReportTypeBlocking(aURI, aLoadInfo, "BlockScriptWithWrongMimeType");
         return NS_ERROR_CORRUPTED_CONTENT;
     }
 
     if (StringBeginsWith(contentType, NS_LITERAL_CSTRING("text/plain"))) {
         // script load has type text/plain
-        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME::text_plain);
+        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::text_plain);
         return NS_OK;
     }
 
     if (StringBeginsWith(contentType, NS_LITERAL_CSTRING("text/xml"))) {
         // script load has type text/xml
-        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME::text_xml);
+        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::text_xml);
         return NS_OK;
     }
 
     if (StringBeginsWith(contentType, NS_LITERAL_CSTRING("application/octet-stream"))) {
         // script load has type application/octet-stream
-        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME::app_octet_stream);
+        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::app_octet_stream);
         return NS_OK;
     }
 
     if (StringBeginsWith(contentType, NS_LITERAL_CSTRING("application/xml"))) {
         // script load has type application/xml
-        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME::app_xml);
+        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::app_xml);
         return NS_OK;
     }
 
     if (StringBeginsWith(contentType, NS_LITERAL_CSTRING("text/html"))) {
         // script load has type text/html
-        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME::text_html);
+        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::text_html);
         return NS_OK;
     }
 
     if (contentType.IsEmpty()) {
         // script load has no type
-        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME::empty);
+        AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::empty);
         return NS_OK;
     }
 
     // script load has unknown type
-    AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME::unknown);
+    AccumulateCategorical(Telemetry::LABELS_SCRIPT_BLOCK_INCORRECT_MIME_2::unknown);
     return NS_OK;
 }
 
 
 nsresult
 nsHttpChannel::CallOnStartRequest()
 {
     LOG(("nsHttpChannel::CallOnStartRequest [this=%p]", this));

--- a/toolkit/components/telemetry/Histograms.json
+++ b/toolkit/components/telemetry/Histograms.json
@@ -7792,24 +7792,24 @@
   },
   "SAFE_MODE_USAGE": {
     "record_in_processes": ["main", "content"],
     "expires_in_version": "never",
     "kind": "enumerated",
     "n_values": 3,
     "description": "Whether the user is in safe mode (No, Yes, Forced)"
   },
-  "SCRIPT_BLOCK_INCORRECT_MIME": {
+  "SCRIPT_BLOCK_INCORRECT_MIME_2": {
     "record_in_processes": ["main", "content"],
     "alert_emails": ["ckerschbaumer@mozilla.com"],
-    "bug_numbers": [1399990],
+    "bug_numbers": [1288361, 1299267, 1399990],
     "expires_in_version": "63",
     "kind": "categorical",
-    "labels": ["unknown","javaScript","image", "audio", "video","text_plain","text_csv","text_xml","app_octet_stream","app_xml","text_html","empty","worker","importSript","script","same_origin","CORS_same_origin","cross_origin"],
-    "description": "Whether the script load has a wrong MIME type"
+    "labels": ["unknown","javaScript","image", "audio", "video","text_plain","text_csv","text_xml","app_octet_stream","app_xml","text_html","empty","worker_load","importSript_load","script_load","same_origin","CORS_same_origin","cross_origin"],
+    "description": "Whether the script load has a MIME type of ...?  (unknown, javaScript, image, audio, video, text_plain, text_csv, text_xml, app_octet_stream, app_xml, text_html, empty). Whether the script load is from ...?  (worker_load, importSript_load, script_load). Whether the script load is of ...?  (same_origin, CORS_same_origin, cross_origin)"
   },
   "XCTO_NOSNIFF_BLOCK_IMAGE": {
     "record_in_processes": ["main", "content"],
     "alert_emails": ["ckerschbaumer@mozilla.com"],
     "bug_numbers": [1302539],
     "expires_in_version": "56",
     "kind": "enumerated",
     "n_values": 3,