--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -1158,18 +1158,17 @@ pref("browser.bookmarks.editDialog.first
 
 // Whether to use a panel that looks like an OS X sheet for customization
 #ifdef XP_MACOSX
 pref("toolbar.customization.usesheet", true);
 #else
 pref("toolbar.customization.usesheet", false);
 #endif
 
-// Disable Flash protected mode to reduce hang/crash rates.
-pref("dom.ipc.plugins.flash.disable-protected-mode", true);
+pref("dom.ipc.plugins.flash.disable-protected-mode", false);
 
 // Feature-disable the protected-mode auto-flip
 pref("browser.flash-protected-mode-flip.enable", true);
 
 // Whether we've already flipped protected mode automatically
 pref("browser.flash-protected-mode-flip.done", false);
 
 #ifdef XP_MACOSX
@@ -1196,17 +1195,16 @@ pref("security.sandbox.windows.log", fal
 // the plugin's nice file name, see: nsPluginTag::GetNiceFileName.
 // On windows these levels are:
 // 0 - no sandbox
 // 1 - sandbox with USER_NON_ADMIN access token level
 // 2 - a more strict sandbox, which might cause functionality issues
 // 3 - the strongest settings we seem to be able to use without breaking
 //     everything, but will definitely cause some functionality restrictions
 pref("dom.ipc.plugins.sandbox-level.default", 0);
-pref("dom.ipc.plugins.sandbox-level.flash", 1);
 
 #if defined(MOZ_CONTENT_SANDBOX)
 // This controls whether the Windows content process sandbox is using a more
 // strict sandboxing policy.  This will require a restart.
 pref("security.sandbox.windows.content.moreStrict", false);
 
 #if defined(MOZ_STACKWALKING)
 // This controls the depth of stack trace that is logged when Windows sandbox