Don't load plugin instances when they have no src URI.

application/palemoon/app/profile/palemoon.js

@@ -682,6 +682,15 @@ pref("plugins.update.notifyUser", false);
 //Enable tri-state option (Always/Never/Ask)
 pref("plugins.click_to_play", true);
 
+// Platform pref is to enable all plugins by default.
+// Uncomment this pref to default to click-to-play
+// pref("plugin.default.state", 1);
+
+// Don't load plugin instances with no src declared.
+// These prefs are documented in detail in all.js.
+pref("plugins.favorfallback.mode", "follow-ctp");
+pref("plugins.favorfallback.rules", "nosrc");
+
 #ifdef XP_WIN
 pref("browser.preferences.instantApply", false);
 #else

dom/base/nsObjectLoadingContent.cpp

@@ -3628,6 +3628,14 @@ nsObjectLoadingContent::HasGoodFallback() {
       }
     }
 
+    // RULE "nosrc":
+    // Use fallback content if the object has not specified a src URI.
+    if (rulesList[i].EqualsLiteral("nosrc")) {
+      if (!mOriginalURI) {
+        return true;
+      }
+    }
+
     // RULE "adobelink":
     // Don't use fallback content when it has a link to adobe's website.
     if (rulesList[i].EqualsLiteral("adobelink")) {