diff --git a/mozilla/modules/libpr0n/src/imgCache.cpp b/mozilla/modules/libpr0n/src/imgCache.cpp
index 210c67ff3f2..46161950292 100644
--- a/mozilla/modules/libpr0n/src/imgCache.cpp
+++ b/mozilla/modules/libpr0n/src/imgCache.cpp
@@ -346,10 +346,12 @@ PRBool imgCache::Remove(nsIURI *aKey)
 NS_IMETHODIMP
 imgCache::Observe(nsISupports* aSubject, const char* aTopic, const PRUnichar* aSomeData)
 {
-  if (strcmp(aTopic, "memory-pressure") == 0 ||
-      strcmp(aTopic, "chrome-flush-skin-caches") == 0 ||
-      strcmp(aTopic, "chrome-flush-caches") == 0)
+  if (strcmp(aTopic, "memory-pressure") == 0) {
+    ClearCache(PR_FALSE);
     ClearCache(PR_TRUE);
-
+  } else if (strcmp(aTopic, "chrome-flush-skin-caches") == 0 ||
+             strcmp(aTopic, "chrome-flush-caches") == 0) {
+    ClearCache(PR_TRUE);
+  }
   return NS_OK;
 }