--- a/toolkit/modules/AsyncShutdown.jsm
+++ b/toolkit/modules/AsyncShutdown.jsm
@@ -96,18 +96,18 @@ function log(msg, prefix = "", error = n
     if (typeof error == "object" && "stack" in error) {
       dump(prefix + error.stack + "\n");
     }
   }
 }
 function warn(msg, error = null) {
   return log(msg, "WARNING: ", error);
 }
-function err(msg, error = null) {
-  return log(msg, "ERROR: ", error);
+function fatalerr(msg, error = null) {
+  return log(msg, "FATAL ERROR: ", error);
 }
 
 // Utility function designed to get the current state of execution
 // of a blocker.
 // We are a little paranoid here to ensure that in case of evaluation
 // error we do not block the AsyncShutdown.
 function safeGetState(fetchState) {
   if (!fetchState) {
@@ -716,17 +716,17 @@ Barrier.prototype = Object.freeze({
           // within the first 200 characters of the message. This
           // helps automatically sort oranges.
           let msg = "AsyncShutdown timeout in " + topic +
             " Conditions: " + JSON.stringify(state) +
             " At least one completion condition failed to complete" +
 	    " within a reasonable amount of time. Causing a crash to" +
 	    " ensure that we do not leave the user with an unresponsive" +
 	    " process draining resources.";
-	  err(msg);
+	  fatalerr(msg);
 	  if (gCrashReporter && gCrashReporter.enabled) {
             let data = {
               phase: topic,
               conditions: state
 	    };
             gCrashReporter.annotateCrashReport("AsyncShutdownTimeout",
               JSON.stringify(data));
 	  } else {