diff --git a/browser/components/extensions/test/browser/browser_ext_tabs_events.js b/browser/components/extensions/test/browser/browser_ext_tabs_events.js
index 4241e98570e9..4cca0b9daab3 100644
--- a/browser/components/extensions/test/browser/browser_ext_tabs_events.js
+++ b/browser/components/extensions/test/browser/browser_ext_tabs_events.js
@@ -303,3 +303,55 @@ add_task(async function testTabRemovalEvent() {
await extension.awaitFinish("tabs-events");
await extension.unload();
});
+
+add_task(async function testTabCreateRelated() {
+ await SpecialPowers.pushPrefEnv({set: [
+ ["browser.tabs.opentabfor.middleclick", true],
+ ["browser.tabs.insertRelatedAfterCurrent", true],
+ ]});
+
+ async function background() {
+ let created;
+ browser.tabs.onCreated.addListener(tab => {
+ browser.test.log(`tabs.onCreated, index=${tab.index}`);
+ browser.test.assertEq(1, tab.index, "expecting tab index of 1");
+ created = tab.id;
+ });
+ browser.tabs.onMoved.addListener((id, info) => {
+ browser.test.log(`tabs.onMoved, from ${info.fromIndex} to ${info.toIndex}`);
+ browser.test.fail("tabMoved was received");
+ });
+ browser.tabs.onRemoved.addListener((tabId, info) => {
+ browser.test.assertEq(created, tabId, "removed id same as created");
+ browser.test.sendMessage("tabRemoved");
+ });
+ }
+
+ let extension = ExtensionTestUtils.loadExtension({
+ manifest: {
+ "permissions": ["tabs"],
+ },
+
+ background,
+ });
+
+ // Create a *opener* tab page which has a link to "example.com".
+ let pageURL = "http://example.com/browser/browser/components/extensions/test/browser/file_dummy.html";
+ let openerTab = await BrowserTestUtils.openNewForegroundTab(gBrowser, pageURL);
+ gBrowser.moveTabTo(openerTab, 0);
+
+ await extension.startup();
+
+ let newTabPromise = BrowserTestUtils.waitForNewTab(gBrowser, "http://example.com/#linkclick", true);
+ await BrowserTestUtils.synthesizeMouseAtCenter("#link_to_example_com",
+ {button: 1}, gBrowser.selectedBrowser);
+ let openTab = await newTabPromise;
+ is(openTab.linkedBrowser.currentURI.spec, "http://example.com/#linkclick",
+ "Middle click should open site to correct url.");
+ BrowserTestUtils.removeTab(openTab);
+
+ await extension.awaitMessage("tabRemoved");
+ await extension.unload();
+
+ BrowserTestUtils.removeTab(openerTab);
+});
diff --git a/browser/components/extensions/test/browser/file_dummy.html b/browser/components/extensions/test/browser/file_dummy.html
index 1a87e28408d0..6353812f4456 100644
--- a/browser/components/extensions/test/browser/file_dummy.html
+++ b/browser/components/extensions/test/browser/file_dummy.html
@@ -5,5 +5,6 @@
Dummy test page
+link