--- a/toolkit/modules/Log.jsm
+++ b/toolkit/modules/Log.jsm
@@ -182,26 +182,26 @@ this.Log = {
           str = frame.name + "()@" + str;
         }
 
         if (str) {
           output.push(str);
         }
         frame = frame.caller;
       }
-      return "Stack trace: " + output.join(" < ");
+      return "Stack trace: " + output.join("\n");
     }
     // Standard JS exception
     if (e.stack) {
       let stack = e.stack;
       // Avoid loading Task.jsm if there's no task on the stack.
       if (stack.includes("/Task.jsm:"))
         stack = Task.Debugging.generateReadableStack(stack);
       return "JS Stack trace: " + stack.trim()
-        .replace(/\n/g, " < ").replace(/@[^@]*?([^\/\.]+\.\w+:)/g, "@$1");
+        .replace(/@[^@]*?([^\/\.]+\.\w+:)/g, "@$1");
     }
 
     return "No traceback available";
   }
 };
 
 /*
  * LogMessage