Don't load enigma and managesieve css where it's not needed

plugins/enigma/enigma.php

@@ -80,8 +80,11 @@ class enigma extends rcube_plugin
 //            $this->register_action('plugin.enigmacerts', array($this, 'preferences_ui'));
 
             $this->load_ui();
+
+            if (empty($_REQUEST['_framed']) || strpos($this->rc->action, 'plugin.enigma') === 0) {
                 $this->ui->add_css();
             }
+        }
 
         $this->add_hook('refresh', array($this, 'refresh'));
     }

plugins/managesieve/managesieve.php

@@ -84,10 +84,10 @@ class managesieve extends rcube_plugin
 
         // include styles
         $skin_path = $this->local_skin_path();
-        if ($this->rc->task == 'settings' || $sieve_action) {
+        if ($sieve_action || ($this->rc->task == 'settings' && empty($_REQUEST['_framed']))) {
             $this->include_stylesheet("$skin_path/managesieve.css");
         }
-        else {
+        else if ($this->rc->task == 'mail') {
             $this->include_stylesheet("$skin_path/managesieve_mail.css");
         }