diff --git a/tools/code-coverage/nsCodeCoverage.cpp b/tools/code-coverage/nsCodeCoverage.cpp
--- a/tools/code-coverage/nsCodeCoverage.cpp
+++ b/tools/code-coverage/nsCodeCoverage.cpp
@@ -46,44 +46,6 @@
     return NS_ERROR_FAILURE;
   }
 
-  ErrorResult result;
-  RefPtr<Promise> promise = Promise::Create(global, result);
-  if (NS_WARN_IF(result.Failed())) {
-    return result.StealNSResult();
-  }
-
-  uint32_t processCount = 0;
-  for (auto* cp : ContentParent::AllProcesses(ContentParent::eLive)) {
-    Unused << cp;
-    ++processCount;
-  }
-
-  if (requestType == RequestType::Flush) {
-    CodeCoverageHandler::FlushCounters();
-  }
-
-  if (processCount == 0) {
-    promise->MaybeResolveWithUndefined();
-  } else {
-    RefPtr<ProcessCount> processCountHolder(new ProcessCount(processCount));
-
-    auto resolve = [processCountHolder, promise](bool unused) {
-      if (--(*processCountHolder) == 0) {
-        promise->MaybeResolveWithUndefined();
-      }
-    };
-
-    auto reject = [promise](ResponseRejectReason&& aReason) {
-      promise->MaybeReject(NS_ERROR_FAILURE);
-    };
-
-    for (auto* cp : ContentParent::AllProcesses(ContentParent::eLive)) {
-      if (requestType == RequestType::Flush) {
-        cp->SendFlushCodeCoverageCounters(resolve, reject);
-      }
-    }
-  }
-
   promise.forget(aPromise);
   return NS_OK;
 }