--- a/security/sandbox/linux/broker/SandboxBrokerPolicyFactory.cpp
+++ b/security/sandbox/linux/broker/SandboxBrokerPolicyFactory.cpp
@@ -77,17 +77,19 @@ AddMesaSysfsPaths(SandboxBroker::Policy*
                                     suffix);
             // libudev will expand the symlink but not do full
             // canonicalization, so it will leave in ".." path
             // components that will be realpath()ed in the
             // broker.  To match this, allow the canonical paths.
             UniqueFreePtr<char[]> realSysPath(realpath(sysPath.get(), nullptr));
             if (realSysPath) {
               nsPrintfCString ueventPath("%s/uevent", realSysPath.get());
+              nsPrintfCString configPath("%s/config", realSysPath.get());
               aPolicy->AddPath(rdonly, ueventPath.get());
+              aPolicy->AddPath(rdonly, configPath.get());
             }
           }
         }
       }
     }
     closedir(dir);
   }
 }