diff --git a/toolkit/components/extensions/test/mochitest/mochitest-common.ini b/toolkit/components/extensions/test/mochitest/mochitest-common.ini
index 8f0a0f167206..7b3bd3dd12ca 100644
--- a/toolkit/components/extensions/test/mochitest/mochitest-common.ini
+++ b/toolkit/components/extensions/test/mochitest/mochitest-common.ini
@@ -109,7 +109,6 @@ skip-if = (toolkit == 'android') # bug 1342577
 [test_ext_sendmessage_no_receiver.html]
 [test_ext_sendmessage_reply.html]
 [test_ext_sendmessage_reply2.html]
-skip-if = true # Bug 1258897
 [test_ext_storage_manager_capabilities.html]
 scheme=https
 [test_ext_subframes_privileges.html]
diff --git a/toolkit/components/extensions/test/mochitest/test_ext_sendmessage_reply2.html b/toolkit/components/extensions/test/mochitest/test_ext_sendmessage_reply2.html
index 348c4ca54d6e..c20a96fda258 100644
--- a/toolkit/components/extensions/test/mochitest/test_ext_sendmessage_reply2.html
+++ b/toolkit/components/extensions/test/mochitest/test_ext_sendmessage_reply2.html
@@ -14,8 +14,6 @@
 "use strict";
 
 function backgroundScript(token, id, otherId) {
-  browser.tabs.create({url: "tab.html"});
-
   browser.runtime.onMessage.addListener((msg, sender, sendReply) => {
     browser.test.assertEq(id, sender.id, `${id}: Got expected sender ID`);
 
@@ -51,6 +49,8 @@ function backgroundScript(token, id, otherId) {
       browser.test.fail(`${id}: Unexpected runtime external message received: ${msg} ${uneval(sender)}`);
     }
   });
+
+  browser.tabs.create({url: "tab.html"});
 }
 
 function contentScript(token, id, otherId) {