diff --git a/dom/base/ChromeUtils.cpp b/dom/base/ChromeUtils.cpp
index 217dca83325f..37ca77ff7b5a 100644
--- a/dom/base/ChromeUtils.cpp
+++ b/dom/base/ChromeUtils.cpp
@@ -70,6 +70,7 @@
 #include "nsDocShell.h"
 #include "nsIException.h"
 #include "VsyncSource.h"
+#include "imgLoader.h"
 
 #ifdef XP_UNIX
 #  include <errno.h>
@@ -1611,6 +1612,15 @@ void ChromeUtils::ClearScriptCache(GlobalObject&,
                                                : Nothing());
 }
 
+void ChromeUtils::ClearResourceCache(GlobalObject&,
+                                     const Optional<bool>& aChrome) {
+  Maybe<bool> chrome = aChrome.WasPassed() ? Some(aChrome.Value()) : Nothing();
+  SharedStyleSheetCache::Clear(chrome);
+  SharedScriptCache::Clear(chrome);
+  imgLoader::PrivateBrowsingLoader()->ClearCache(chrome);
+  imgLoader::NormalLoader()->ClearCache(chrome);
+}
+
 #define PROCTYPE_TO_WEBIDL_CASE(_procType, _webidl) \
   case mozilla::ProcType::_procType:                \
     return WebIDLProcType::_webidl
diff --git a/dom/base/ChromeUtils.h b/dom/base/ChromeUtils.h
index 08de82abc14b..29fbcfabfb8a 100644
--- a/dom/base/ChromeUtils.h
+++ b/dom/base/ChromeUtils.h
@@ -216,6 +216,9 @@ class ChromeUtils {
   static void ClearScriptCache(GlobalObject& aGlobal,
                                const Optional<bool>& aChrome);
 
+  static void ClearResourceCache(GlobalObject& aGlobal,
+                                 const Optional<bool>& aChrome);
+
   static void SetPerfStatsCollectionMask(GlobalObject& aGlobal, uint64_t aMask);
 
   static already_AddRefed<Promise> CollectPerfStats(GlobalObject& aGlobal,
diff --git a/dom/chrome-webidl/ChromeUtils.webidl b/dom/chrome-webidl/ChromeUtils.webidl
index 8495459f9849..6eabcf6354b2 100644
--- a/dom/chrome-webidl/ChromeUtils.webidl
+++ b/dom/chrome-webidl/ChromeUtils.webidl
@@ -269,6 +269,15 @@ namespace ChromeUtils {
    */
   undefined clearScriptCache(optional boolean chrome);
 
+  /**
+   * Clears the entire resource cache (stylesheets, JavaScripts, and images).
+   *
+   * If chrome parameter is passed and true, this clears chrome cache.
+   * If chrome parameter is passed and false, this clears content cache.
+   * If chrome parameter is not passed, this clears all cache.
+   */
+  undefined clearResourceCache(optional boolean chrome);
+
   /**
    * Clears the Messaging Layer Security state by schemeless site.
    * This includes associated state-partitioned cache.