--- a/security/sandbox/linux/broker/SandboxBrokerPolicyFactory.cpp
+++ b/security/sandbox/linux/broker/SandboxBrokerPolicyFactory.cpp
@@ -134,16 +134,20 @@ SandboxBrokerPolicyFactory::SandboxBroke
   }
   // If the above fails at any point, fall back to a very good guess.
   if (NS_FAILED(rv)) {
     policy->AddDir(rdwrcr, "/tmp");
   }
 
   // Bug 1308851: NVIDIA proprietary driver when using WebGL
   policy->AddPrefix(rdwr, "/dev", "nvidia");
+
+  // Bug 1312678: radeonsi/Intel with DRI when using WebGL
+  policy->AddDir(rdwr, "/dev/dri");
+
   mCommonContentPolicy.reset(policy);
 #endif
 }
 
 #ifdef MOZ_CONTENT_SANDBOX
 UniquePtr<SandboxBroker::Policy>
 SandboxBrokerPolicyFactory::GetContentPolicy(int aPid)
 {