--- a/devtools/client/styleeditor/test/browser_styleeditor_fetch-from-netmonitor.js
+++ b/devtools/client/styleeditor/test/browser_styleeditor_fetch-from-netmonitor.js
@@ -29,16 +29,20 @@ add_task(async function() {
   let styleeditor = await toolbox.selectTool("styleeditor");
   let ui = styleeditor.UI;
 
   info("Waiting for the sources to be loaded.");
   await ui.editors[0].getSourceEditor();
   await ui.selectStyleSheet(ui.editors[1].styleSheet);
   await ui.editors[1].getSourceEditor();
 
+  // Wait till there is 5 requests in Netmonitor store.
+  // (i.e. the Styleeditor panel performed one request).
+  await waitUntil(() => getSortedRequests(store.getState()).length == 5);
+
   info("Checking Netmonitor contents.");
   let shortRequests = [];
   let longRequests = [];
   let hugeRequests = [];
   for (let item of getSortedRequests(store.getState())) {
     if (item.url.endsWith("doc_short_string.css")) {
       shortRequests.push(item);
     }