--- a/devtools/client/netmonitor/test/browser.ini
+++ b/devtools/client/netmonitor/test/browser.ini
@@ -140,16 +140,17 @@ skip-if = true # Bug 1479782
 [browser_net_edit_resend_xhr.js]
 [browser_net_filter-01.js]
 [browser_net_filter-02.js]
 [browser_net_filter-03.js]
 [browser_net_filter-04.js]
 [browser_net_filter-autocomplete.js]
 [browser_net_filter-flags.js]
 [browser_net_filter-value-preserved.js]
+[browser_net_fission_switch_target.js]
 [browser_net_footer-summary.js]
 [browser_net_header-ref-policy.js]
 [browser_net_decode-url.js]
 [browser_net_decode-params.js]
 [browser_net_headers-alignment.js]
 [browser_net_headers_filter.js]
 [browser_net_headers_sorted.js]
 [browser_net_headers-resize.js]

new file mode 100644
--- /dev/null
+++ b/devtools/client/netmonitor/test/browser_net_fission_switch_target.js
@@ -0,0 +1,63 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test switching for the top-level target.
+
+const PARENT_PROCESS_URI = "about:robots";
+const PARENT_PROCESS_URI_NETWORK_COUNT = 0;
+const CONTENT_PROCESS_URI = CUSTOM_GET_URL;
+const CONTENT_PROCESS_URI_NETWORK_COUNT = 1;
+
+add_task(async function() {
+  await pushPref("devtools.target-switching.enabled", true);
+
+  // We use about:robots, because this page will run in the parent process.
+  // Navigating from about:robots to a regular content page will always trigger a target
+  // switch, with or without fission.
+
+  info("Open a page that runs on the content process and the net monitor");
+  const { monitor, tab, toolbox } = await initNetMonitor(CONTENT_PROCESS_URI);
+  const { store } = monitor.panelWin;
+
+  info("Reload the page to show the network event");
+  const waitForReloading = waitForNetworkEvents(
+    monitor,
+    CONTENT_PROCESS_URI_NETWORK_COUNT
+  );
+  tab.linkedBrowser.reload();
+  await waitForReloading;
+
+  info("Navigate to a page that runs on parent process");
+  await navigateTo(PARENT_PROCESS_URI, toolbox, monitor, tab);
+  is(
+    store.getState().requests.requests.length,
+    PARENT_PROCESS_URI_NETWORK_COUNT,
+    `Request count of ${PARENT_PROCESS_URI} is correct`
+  );
+
+  info("Return to a page that runs on content process again");
+  await navigateTo(CONTENT_PROCESS_URI, toolbox, monitor, tab);
+
+  info(`Execute more requests in ${CONTENT_PROCESS_URI}`);
+  const currentRequestCount = store.getState().requests.requests.length;
+  const additionalRequestCount = 3;
+  await performRequests(monitor, tab, additionalRequestCount);
+  is(
+    store.getState().requests.requests.length - currentRequestCount,
+    additionalRequestCount,
+    "Additional request count is reflected correctly"
+  );
+
+  await teardown(monitor);
+});
+
+async function navigateTo(uri, toolbox, monitor, tab) {
+  const onSwitched = once(toolbox, "switched-target");
+  const onReloaded = once(monitor, "reloaded");
+  BrowserTestUtils.loadURI(tab.linkedBrowser, uri);
+  await onSwitched;
+  await onReloaded;
+  ok(true, "All events we expected were fired");
+}