diff --git a/dom/workers/ScriptLoader.cpp b/dom/workers/ScriptLoader.cpp
index 6b036b3cff..ae023b520e 100644
--- a/dom/workers/ScriptLoader.cpp
+++ b/dom/workers/ScriptLoader.cpp
@@ -464,6 +464,8 @@ private:
   nsCOMPtr<nsIURI> mBaseURI;
   mozilla::dom::ChannelInfo mChannelInfo;
   UniquePtr<PrincipalInfo> mPrincipalInfo;
+  nsCString mCSPHeaderValue;
+  nsCString mCSPReportOnlyHeaderValue;
 };
 
 NS_IMPL_ISUPPORTS(CacheScriptLoader, nsIStreamLoaderObserver)
@@ -1231,7 +1233,9 @@ private:
   DataReceivedFromCache(uint32_t aIndex, const uint8_t* aString,
                         uint32_t aStringLen,
                         const mozilla::dom::ChannelInfo& aChannelInfo,
-                        UniquePtr<PrincipalInfo> aPrincipalInfo)
+                        UniquePtr<PrincipalInfo> aPrincipalInfo,
+                        const nsACString& aCSPHeaderValue,
+                        const nsACString& aCSPReportOnlyHeaderValue)
   {
     AssertIsOnMainThread();
     MOZ_ASSERT(aIndex < mLoadInfos.Length());
@@ -1286,6 +1290,10 @@ private:
 
       mWorkerPrivate->InitChannelInfo(aChannelInfo);
       mWorkerPrivate->SetPrincipal(responsePrincipal, loadGroup);
+
+      rv = mWorkerPrivate->SetCSPFromHeaderValues(aCSPHeaderValue,
+                                                  aCSPReportOnlyHeaderValue);
+      MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
     }
 
     if (NS_SUCCEEDED(rv)) {
@@ -1699,6 +1707,14 @@ CacheScriptLoader::ResolvedCallback(JSContext* aCx,
     return;
   }
 
+  InternalHeaders* headers = response->GetInternalHeaders();
+
+  IgnoredErrorResult ignored;
+  headers->Get(NS_LITERAL_CSTRING("content-security-policy"),
+               mCSPHeaderValue, ignored);
+  headers->Get(NS_LITERAL_CSTRING("content-security-policy-report-only"),
+               mCSPReportOnlyHeaderValue, ignored);
+
   nsCOMPtr<nsIInputStream> inputStream;
   response->GetBody(getter_AddRefs(inputStream));
   mChannelInfo = response->GetChannelInfo();
@@ -1710,7 +1726,8 @@ CacheScriptLoader::ResolvedCallback(JSContext* aCx,
   if (!inputStream) {
     mLoadInfo.mCacheStatus = ScriptLoadInfo::Cached;
     mRunnable->DataReceivedFromCache(mIndex, (uint8_t*)"", 0, mChannelInfo,
-                                     Move(mPrincipalInfo));
+                                     Move(mPrincipalInfo), mCSPHeaderValue,
+                                     mCSPReportOnlyHeaderValue);
     return;
   }
 
@@ -1770,7 +1787,8 @@ CacheScriptLoader::OnStreamComplete(nsIStreamLoader* aLoader, nsISupports* aCont
 
   MOZ_ASSERT(mPrincipalInfo);
   mRunnable->DataReceivedFromCache(mIndex, aString, aStringLen, mChannelInfo,
-                                   Move(mPrincipalInfo));
+                                   Move(mPrincipalInfo), mCSPHeaderValue,
+                                   mCSPReportOnlyHeaderValue);
   return NS_OK;
 }