diff --git a/devtools/client/framework/test/metrics/browser_metrics_debugger.js b/devtools/client/framework/test/metrics/browser_metrics_debugger.js
index 63910d3a0957..4ca24a0bbb79 100644
--- a/devtools/client/framework/test/metrics/browser_metrics_debugger.js
+++ b/devtools/client/framework/test/metrics/browser_metrics_debugger.js
@@ -14,11 +14,17 @@ const TEST_URL =
 
 add_task(async function() {
   const toolbox = await openNewTabAndToolbox(TEST_URL, "jsdebugger");
-  const panel = toolbox.getCurrentPanel();
+  const toolboxBrowserLoader = toolbox.win.getBrowserLoaderForWindow();
 
   // Retrieve the browser loader dedicated to the Debugger.
+  const panel = toolbox.getCurrentPanel();
   const debuggerLoader = panel.panelWin.getBrowserLoaderForWindow();
-  const loaders = [loader.loader, debuggerLoader.loader];
+
+  const loaders = [
+    loader.loader,
+    toolboxBrowserLoader.loader,
+    debuggerLoader.loader,
+  ];
 
   const whitelist = [
     "@loader/unload.js",
@@ -33,6 +39,7 @@ add_task(async function() {
     "resource://devtools/client/shared/vendor/react-redux.js",
     "resource://devtools/client/shared/vendor/redux.js",
     "resource://devtools/client/debugger/src/workers/parser/index.js",
+    "resource://devtools/client/shared/source-map/index.js",
   ];
   runDuplicatedModulesTest(loaders, whitelist);
 
diff --git a/devtools/client/framework/test/metrics/browser_metrics_inspector.js b/devtools/client/framework/test/metrics/browser_metrics_inspector.js
index 7c976bc8ccc2..7d50e4e6c7b7 100644
--- a/devtools/client/framework/test/metrics/browser_metrics_inspector.js
+++ b/devtools/client/framework/test/metrics/browser_metrics_inspector.js
@@ -13,14 +13,30 @@ const TEST_URL =
   "data:text/html;charset=UTF-8,<div>Inspector modules load test</div>";
 
 add_task(async function() {
-  await openNewTabAndToolbox(TEST_URL, "inspector");
+  const toolbox = await openNewTabAndToolbox(TEST_URL, "inspector");
+  const toolboxBrowserLoader = toolbox.win.getBrowserLoaderForWindow();
 
-  // The inspector does not use a dedicated browser loader.
-  const loaders = [loader.loader];
+  // Most panels involve three loaders:
+  // - the global devtools loader
+  // - the browser loader used by the toolbox
+  // - a specific browser loader created for the panel
+  // But the inspector is a specific case, because it reuses the BrowserLoader
+  // of the toolbox to load its react components. This is why we only list
+  // two loaders here.
+  const loaders = [loader.loader, toolboxBrowserLoader.loader];
 
-  // Duplicated modules whitelist for the inspector is empty because the
-  // inspector is only using the DevTools loader.
-  runDuplicatedModulesTest(loaders, []);
+  runDuplicatedModulesTest(loaders, [
+    "@loader/unload.js",
+    "@loader/options.js",
+    "chrome.js",
+    "resource://devtools/client/shared/vendor/react.js",
+    "resource://devtools/client/shared/vendor/react-dom-factories.js",
+    "resource://devtools/client/shared/vendor/react-prop-types.js",
+    "resource://devtools/client/shared/vendor/react-redux.js",
+    "resource://devtools/client/shared/vendor/redux.js",
+    "resource://devtools/client/inspector/flexbox/actions/index.js",
+    "resource://devtools/client/inspector/grids/actions/index.js",
+  ]);
 
   runMetricsTest({
     filterString: "devtools/client/inspector",
diff --git a/devtools/client/framework/test/metrics/browser_metrics_netmonitor.js b/devtools/client/framework/test/metrics/browser_metrics_netmonitor.js
index e83d584e94a5..e4f6008af94a 100644
--- a/devtools/client/framework/test/metrics/browser_metrics_netmonitor.js
+++ b/devtools/client/framework/test/metrics/browser_metrics_netmonitor.js
@@ -14,11 +14,17 @@ const TEST_URL =
 
 add_task(async function() {
   const toolbox = await openNewTabAndToolbox(TEST_URL, "netmonitor");
-  const panel = toolbox.getCurrentPanel();
+  const toolboxBrowserLoader = toolbox.win.getBrowserLoaderForWindow();
 
   // Retrieve the browser loader dedicated to the Netmonitor.
+  const panel = toolbox.getCurrentPanel();
   const netmonitorLoader = panel.panelWin.getBrowserLoaderForWindow();
-  const loaders = [loader.loader, netmonitorLoader.loader];
+
+  const loaders = [
+    loader.loader,
+    toolboxBrowserLoader.loader,
+    netmonitorLoader.loader,
+  ];
 
   // Uncomment after Bug 1581068 is fixed, otherwise the test might fail too
   // frequently.
diff --git a/devtools/client/framework/test/metrics/browser_metrics_webconsole.js b/devtools/client/framework/test/metrics/browser_metrics_webconsole.js
index 5d4744863c67..e313396cf77f 100644
--- a/devtools/client/framework/test/metrics/browser_metrics_webconsole.js
+++ b/devtools/client/framework/test/metrics/browser_metrics_webconsole.js
@@ -14,11 +14,17 @@ const TEST_URL =
 
 add_task(async function() {
   const toolbox = await openNewTabAndToolbox(TEST_URL, "webconsole");
-  const panel = toolbox.getCurrentPanel();
+  const toolboxBrowserLoader = toolbox.win.getBrowserLoaderForWindow();
 
   // Retrieve the browser loader dedicated to the WebConsole.
+  const panel = toolbox.getCurrentPanel();
   const webconsoleLoader = panel._frameWindow.getBrowserLoaderForWindow();
-  const loaders = [loader.loader, webconsoleLoader.loader];
+
+  const loaders = [
+    loader.loader,
+    toolboxBrowserLoader.loader,
+    webconsoleLoader.loader,
+  ];
 
   const whitelist = [
     "@loader/unload.js",
@@ -30,6 +36,10 @@ add_task(async function() {
     "resource://devtools/client/webconsole/utils/l10n.js",
     "resource://devtools/client/netmonitor/src/utils/request-utils.js",
     "resource://devtools/client/webconsole/types.js",
+    "resource://devtools/client/shared/vendor/react.js",
+    "resource://devtools/client/shared/vendor/react-dom.js",
+    "resource://devtools/client/shared/vendor/react-prop-types.js",
+    "resource://devtools/client/shared/vendor/react-dom-factories.js",
   ];
   runDuplicatedModulesTest(loaders, whitelist);