enhance(frontend): window.openやaタグにnoopenerオプションをつける (MisskeyIO#283)

packages/frontend/src/components/global/MkA.vue

@@ -61,7 +61,7 @@ function onContextmenu(ev) {
 		icon: 'ti ti-external-link',
 		text: i18n.ts.openInNewTab,
 		action: () => {
-			window.open(props.to, '_blank');
+			window.open(props.to, '_blank', 'noopener');
 		},
 	}, {
 		icon: 'ti ti-link',

packages/frontend/src/components/global/MkUrl.vue

@@ -5,7 +5,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <template>
 <component
-	:is="self ? 'MkA' : 'a'" ref="el" :class="$style.root" class="_link" :[attr]="self ? props.url.substring(local.length) : props.url" :rel="rel" :target="target"
+	:is="self ? 'MkA' : 'a'" ref="el" :class="$style.root" class="_link" :[attr]="self ? props.url.substring(local.length) : props.url" :rel="rel ?? 'nofollow noopener'" :target="target"
 	@contextmenu.stop="() => {}"
 >
 	<template v-if="!self">