--- a/security/sandbox/linux/broker/SandboxBrokerPolicyFactory.cpp
+++ b/security/sandbox/linux/broker/SandboxBrokerPolicyFactory.cpp
@@ -126,25 +126,25 @@ SandboxBrokerPolicyFactory::SandboxBroke
   mCommonContentPolicy.reset(policy);
 #endif
 }
 
 #ifdef MOZ_CONTENT_SANDBOX
 UniquePtr<SandboxBroker::Policy>
 SandboxBrokerPolicyFactory::GetContentPolicy(int aPid)
 {
+  // Policy entries that vary per-process (currently the only reason
+  // that can happen is because they contain the pid) are added here.
+#if defined(MOZ_WIDGET_GONK)
   // Allow overriding "unsupported"ness with a pref, for testing.
   if (!IsSystemSupported() &&
       Preferences::GetInt("security.sandbox.content.level") <= 1) {
     return nullptr;
   }
 
-  // Policy entries that vary per-process (currently the only reason
-  // that can happen is because they contain the pid) are added here.
-#if defined(MOZ_WIDGET_GONK)
   MOZ_ASSERT(NS_IsMainThread());
   MOZ_ASSERT(mCommonContentPolicy);
   UniquePtr<SandboxBroker::Policy>
     policy(new SandboxBroker::Policy(*mCommonContentPolicy));
 
   // Bug 1029337: where the profiler writes the data.
   nsPrintfCString profilerLogPath("/data/local/tmp/profile_%d_%d.txt",
                                   GeckoProcessType_Content, aPid);
@@ -154,16 +154,20 @@ SandboxBrokerPolicyFactory::GetContentPo
   policy->AddPath(rdonly, nsPrintfCString("/proc/%d/maps", aPid).get());
 
   // Bug 1198552: memory reporting.
   policy->AddPath(rdonly, nsPrintfCString("/proc/%d/statm", aPid).get());
   policy->AddPath(rdonly, nsPrintfCString("/proc/%d/smaps", aPid).get());
 
   return policy;
 #elif defined(XP_LINUX)
+  // File broker usage is controlled through a pref.
+  if (Preferences::GetInt("security.sandbox.content.level") <= 1) {
+    return nullptr;
+  }
   MOZ_ASSERT(NS_IsMainThread());
   MOZ_ASSERT(mCommonContentPolicy);
   UniquePtr<SandboxBroker::Policy>
     policy(new SandboxBroker::Policy(*mCommonContentPolicy));
   // Return the common policy.
   return policy;
 #endif
 }