diff --git a/phpBB/adm/style/acp_ext_disable.html b/phpBB/adm/style/acp_ext_disable.html
index d650544ff7..d2b5c46fe8 100644
--- a/phpBB/adm/style/acp_ext_disable.html
+++ b/phpBB/adm/style/acp_ext_disable.html
@@ -8,19 +8,19 @@
 	<p>{L_EXTENSION_DISABLE_EXPLAIN}</p>
 
 	<!-- IF PRE -->
-	<div class="errorbox">
+	<fieldset>
+		<h2>{L_CONFIRM}</h2>
 		<p>{L_CONFIRM_MESSAGE}</p>
-	</div>
+	</fieldset>
 
 	<form id="acp_extensions" method="post" action="{U_DISABLE}">
 	<fieldset class="submit-buttons">
-		<legend>{L_EXTENSION_DISABLE}</legend>
 		<input class="button1" type="submit" name="disable" value="{L_EXTENSION_DISABLE}" />
 		<input class="button2" type="submit" name="cancel" value="{L_CANCEL}" />
 	</fieldset>
 	</form>
 	<!-- ELSEIF S_NEXT_STEP -->
-		<div class="errorbox">
+		<div class="successbox notice">
 			<p>{L_EXTENSION_DISABLE_IN_PROGRESS}</p>
 		</div>
 	<!-- ELSE -->
diff --git a/phpBB/adm/style/acp_ext_enable.html b/phpBB/adm/style/acp_ext_enable.html
index 42523f1f58..8a4a35359e 100644
--- a/phpBB/adm/style/acp_ext_enable.html
+++ b/phpBB/adm/style/acp_ext_enable.html
@@ -14,19 +14,19 @@
 		<p><a href="{U_RETURN}">{L_RETURN_TO_EXTENSION_LIST}</a></p>
 	</div>
 	<!-- ELSEIF PRE -->
-	<div class="errorbox">
+	<fieldset>
+		<h2>{L_CONFIRM}</h2>
 		<p>{L_CONFIRM_MESSAGE}</p>
-	</div>
+	</fieldset>
 
 	<form id="acp_extensions" method="post" action="{U_ENABLE}">
 	<fieldset class="submit-buttons">
-		<legend>{L_EXTENSION_ENABLE}</legend>
 		<input class="button1" type="submit" name="enable" value="{L_EXTENSION_ENABLE}" />
 		<input class="button2" type="submit" name="cancel" value="{L_CANCEL}" />
 	</fieldset>
 	</form>
 	<!-- ELSEIF S_NEXT_STEP -->
-		<div class="errorbox">
+		<div class="successbox notice">
 			<p>{L_EXTENSION_ENABLE_IN_PROGRESS}</p>
 		</div>
 	<!-- ELSE -->
diff --git a/phpBB/adm/style/admin.css b/phpBB/adm/style/admin.css
index 60a5cd9472..a61890bc75 100644
--- a/phpBB/adm/style/admin.css
+++ b/phpBB/adm/style/admin.css
@@ -1076,6 +1076,10 @@ fieldset {
 	border-radius: 3px;
 }
 
+fieldset h2 {
+	margin-top: 0;
+}
+
 .rtl fieldset {
 	border-top: 1px solid #D7D7D7;
 	border-right: 1px solid #D7D7D7;
diff --git a/tests/functional/extension_acp_test.php b/tests/functional/extension_acp_test.php
index 5f02158e20..8a724f2133 100644
--- a/tests/functional/extension_acp_test.php
+++ b/tests/functional/extension_acp_test.php
@@ -157,7 +157,7 @@ class phpbb_functional_extension_acp_test extends phpbb_functional_test_case
 		$this->assertContainsLang('EXTENSION_ACTIONS', $crawler->filter('div.main thead')->text());
 
 		$crawler = self::request('GET', 'adm/index.php?i=acp_extensions&mode=main&action=enable_pre&ext_name=vendor%2Fmoo&sid=' . $this->sid);
-		$this->assertContains($this->lang('EXTENSION_ENABLE_CONFIRM', 'phpBB Moo Extension'), $crawler->filter('.errorbox')->text());
+		$this->assertContains($this->lang('EXTENSION_ENABLE_CONFIRM', 'phpBB Moo Extension'), $crawler->filter('#main')->text());
 	}
 
 	public function test_disable_pre()
@@ -169,7 +169,7 @@ class phpbb_functional_extension_acp_test extends phpbb_functional_test_case
 		$this->assertContainsLang('EXTENSION_ACTIONS', $crawler->filter('div.main thead')->text());
 
 		$crawler = self::request('GET', 'adm/index.php?i=acp_extensions&mode=main&action=disable_pre&ext_name=vendor2%2Ffoo&sid=' . $this->sid);
-		$this->assertContains($this->lang('EXTENSION_DISABLE_CONFIRM', 'phpBB Foo Extension'), $crawler->filter('.errorbox')->text());
+		$this->assertContains($this->lang('EXTENSION_DISABLE_CONFIRM', 'phpBB Foo Extension'), $crawler->filter('#main')->text());
 	}
 
 	public function test_delete_data_pre()