diff --git a/parser/html/nsHtml5SpeculativeLoad.cpp b/parser/html/nsHtml5SpeculativeLoad.cpp
index bdc963a9fc0..0a1462d806d 100644
--- a/parser/html/nsHtml5SpeculativeLoad.cpp
+++ b/parser/html/nsHtml5SpeculativeLoad.cpp
@@ -27,6 +27,9 @@ nsHtml5SpeculativeLoad::Perform(nsHtml5TreeOpExecutor* aExecutor)
     case eSpeculativeLoadBase:
       aExecutor->SetSpeculationBase(mUrl);
       break;
+    case eSpeculativeLoadCSP:
+      aExecutor->AddSpeculationCSP(mMetaCSP);
+      break;
     case eSpeculativeLoadMetaReferrer:
       aExecutor->SetSpeculationReferrerPolicy(mReferrerPolicy);
       break;
diff --git a/parser/html/nsHtml5SpeculativeLoad.h b/parser/html/nsHtml5SpeculativeLoad.h
index 0eef9874400..57dcc2697d2 100644
--- a/parser/html/nsHtml5SpeculativeLoad.h
+++ b/parser/html/nsHtml5SpeculativeLoad.h
@@ -15,6 +15,7 @@ enum eHtml5SpeculativeLoad {
   eSpeculativeLoadUninitialized,
 #endif
   eSpeculativeLoadBase,
+  eSpeculativeLoadCSP,
   eSpeculativeLoadMetaReferrer,
   eSpeculativeLoadImage,
   eSpeculativeLoadOpenPicture,
@@ -41,6 +42,14 @@ class nsHtml5SpeculativeLoad {
       mUrl.Assign(aUrl);
     }
 
+    inline void InitMetaCSP(const nsAString& aCSP) {
+      NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
+                      "Trying to reinitialize a speculative load!");
+      mOpCode = eSpeculativeLoadCSP;
+      mMetaCSP.Assign(
+        nsContentUtils::TrimWhitespace<nsContentUtils::IsHTMLWhitespace>(aCSP));
+    }
+
     inline void InitMetaReferrerPolicy(const nsAString& aReferrerPolicy) {
       NS_PRECONDITION(mOpCode == eSpeculativeLoadUninitialized,
                       "Trying to reinitialize a speculative load!");
@@ -187,6 +196,8 @@ class nsHtml5SpeculativeLoad {
     eHtml5SpeculativeLoad mOpCode;
     nsString mUrl;
     nsString mReferrerPolicy;
+    nsString mMetaCSP;
+
     /**
      * If mOpCode is eSpeculativeLoadStyle or eSpeculativeLoadScript[FromHead]
      * then this is the value of the "charset" attribute. For
diff --git a/parser/html/nsHtml5TreeBuilderCppSupplement.h b/parser/html/nsHtml5TreeBuilderCppSupplement.h
index ae2de676775..cc26449067f 100644
--- a/parser/html/nsHtml5TreeBuilderCppSupplement.h
+++ b/parser/html/nsHtml5TreeBuilderCppSupplement.h
@@ -236,6 +236,14 @@ nsHtml5TreeBuilder::createElement(int32_t aNamespace, nsIAtom* aName,
           }
         } else if (nsHtml5Atoms::meta == aName) {
           if (nsHtml5Portability::lowerCaseLiteralEqualsIgnoreAsciiCaseString(
+                      "content-security-policy",
+                      aAttributes->getValue(nsHtml5AttributeName::ATTR_HTTP_EQUIV))) {
+            nsString* csp = aAttributes->getValue(nsHtml5AttributeName::ATTR_CONTENT);
+            if (csp) {
+              mSpeculativeLoadQueue.AppendElement()->InitMetaCSP(*csp);
+            }
+          }
+          else if (nsHtml5Portability::lowerCaseLiteralEqualsIgnoreAsciiCaseString(
                       "referrer",
                       aAttributes->getValue(nsHtml5AttributeName::ATTR_NAME))) {
             nsString* referrerPolicy = aAttributes->getValue(nsHtml5AttributeName::ATTR_CONTENT);
diff --git a/parser/html/nsHtml5TreeOpExecutor.cpp b/parser/html/nsHtml5TreeOpExecutor.cpp
index 7f489ea90c1..2408cced895 100644
--- a/parser/html/nsHtml5TreeOpExecutor.cpp
+++ b/parser/html/nsHtml5TreeOpExecutor.cpp
@@ -6,13 +6,16 @@
 
 #include "mozilla/DebugOnly.h"
 #include "mozilla/Likely.h"
+#include "mozilla/dom/nsCSPService.h"
 
 #include "nsError.h"
 #include "nsHtml5TreeOpExecutor.h"
 #include "nsScriptLoader.h"
 #include "nsIContentViewer.h"
+#include "nsIContentSecurityPolicy.h"
 #include "nsIDocShellTreeItem.h"
 #include "nsIDocShell.h"
+#include "nsIDOMDocument.h"
 #include "nsIScriptGlobalObject.h"
 #include "nsIScriptSecurityManager.h"
 #include "nsIWebShellServices.h"
@@ -1014,6 +1017,43 @@ nsHtml5TreeOpExecutor::SetSpeculationReferrerPolicy(const nsAString& aReferrerPo
   return SetSpeculationReferrerPolicy(policy);
 }
 
+void
+nsHtml5TreeOpExecutor::AddSpeculationCSP(const nsAString& aCSP)
+{
+  if (!CSPService::sCSPEnabled) {
+    return;
+  }
+
+  NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
+
+  nsIPrincipal* principal = mDocument->NodePrincipal();
+  nsCOMPtr<nsIContentSecurityPolicy> preloadCsp;
+  nsresult rv = principal->GetPreloadCsp(getter_AddRefs(preloadCsp));
+  NS_ENSURE_SUCCESS_VOID(rv);
+  if (!preloadCsp) {
+    preloadCsp = do_CreateInstance("@mozilla.org/cspcontext;1", &rv);
+    NS_ENSURE_SUCCESS_VOID(rv);
+
+    // Store the request context for violation reports
+    nsCOMPtr<nsIDOMDocument> domDoc = do_QueryInterface(mDocument);
+    rv = preloadCsp->SetRequestContext(domDoc, nullptr);
+    NS_ENSURE_SUCCESS_VOID(rv);
+
+    // set the new csp
+    rv = principal->SetPreloadCsp(preloadCsp);
+    NS_ENSURE_SUCCESS_VOID(rv);
+  }
+
+  // please note that meta CSPs and CSPs delivered through a header need
+  // to be joined together.
+  rv = preloadCsp->AppendPolicy(aCSP,
+                                false, // csp via meta tag can not be report only
+                                true); // delivered through the meta tag
+  NS_ENSURE_SUCCESS_VOID(rv);
+
+  mDocument->ApplySettingsFromCSP(true);
+}
+
 void
 nsHtml5TreeOpExecutor::SetSpeculationReferrerPolicy(ReferrerPolicy aReferrerPolicy)
 {
diff --git a/parser/html/nsHtml5TreeOpExecutor.h b/parser/html/nsHtml5TreeOpExecutor.h
index e9f0e886815..c4b6a45943b 100644
--- a/parser/html/nsHtml5TreeOpExecutor.h
+++ b/parser/html/nsHtml5TreeOpExecutor.h
@@ -275,6 +275,8 @@ class nsHtml5TreeOpExecutor final : public nsHtml5DocumentBuilder,
     void SetSpeculationReferrerPolicy(ReferrerPolicy aReferrerPolicy);
     void SetSpeculationReferrerPolicy(const nsAString& aReferrerPolicy);
 
+    void AddSpeculationCSP(const nsAString& aCSP);
+
     void AddBase(const nsAString& aURL);
 
     static void InitializeStatics();