diff --git a/lib/installedtest.pm b/lib/installedtest.pm
index 0d612174..bbbd271b 100644
--- a/lib/installedtest.pm
+++ b/lib/installedtest.pm
@@ -67,7 +67,7 @@ sub start_cockpit {
     my $self = shift;
     my $login = shift || 0;
     # run firefox directly in X as root. never do this, kids!
-    type_string "startx /usr/bin/firefox\n";
+    type_string "startx /usr/bin/firefox -width 1024 -height 768\n";
     assert_screen "firefox";
     # open a new tab so we don't race with the default page load
     # (also focuses the location bar for us)
diff --git a/tests/freeipa_password_change_postinstall.pm b/tests/freeipa_password_change_postinstall.pm
index fbdbf816..aff08196 100644
--- a/tests/freeipa_password_change_postinstall.pm
+++ b/tests/freeipa_password_change_postinstall.pm
@@ -8,7 +8,7 @@ sub run {
     $self->console_login(user=>'root');
     # clear browser data so we don't go back to the 'admin' login
     assert_script_run 'rm -rf /root/.mozilla';
-    type_string "startx /usr/bin/firefox\n";
+    type_string "startx /usr/bin/firefox -width 1024 -height 768\n";
     assert_screen "firefox";
     start_webui("test1", "batterystaple");
     assert_and_click "freeipa_webui_actions";
diff --git a/tests/freeipa_webui_postinstall.pm b/tests/freeipa_webui_postinstall.pm
index f894d1a5..332e9f77 100644
--- a/tests/freeipa_webui_postinstall.pm
+++ b/tests/freeipa_webui_postinstall.pm
@@ -8,7 +8,7 @@ sub run {
     # we're restarting firefox (instead of using the same one from
     # freeipa_client_postinstall) so Firefox's trusted CA store
     # refreshes and it trusts the web server cert
-    type_string "startx /usr/bin/firefox\n";
+    type_string "startx /usr/bin/firefox -width 1024 -height 768\n";
     assert_screen "firefox";
     start_webui("admin", "monkeys123");
     add_user("test3", "Three");