diff --git a/packages/backend/src/mfm/to-html.ts b/packages/backend/src/mfm/to-html.ts
index 65decee83d..5ef466fc3a 100644
--- a/packages/backend/src/mfm/to-html.ts
+++ b/packages/backend/src/mfm/to-html.ts
@@ -1,5 +1,6 @@
 import { JSDOM } from "jsdom";
-import type * as mfm from "mfm-js";
+// import type * as mfm from "mfm-js";
+import type * as mfm from "ffm-js";
 import config from "@/config/index.js";
 import { intersperse } from "@/prelude/array.js";
 import type { IMentionedRemoteUsers } from "@/models/entities/note.js";
diff --git a/packages/backend/src/misc/extract-custom-emojis-from-mfm.ts b/packages/backend/src/misc/extract-custom-emojis-from-mfm.ts
index 7de32e6d60..4f6d10e2d9 100644
--- a/packages/backend/src/misc/extract-custom-emojis-from-mfm.ts
+++ b/packages/backend/src/misc/extract-custom-emojis-from-mfm.ts
@@ -1,4 +1,4 @@
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import { unique } from "@/prelude/array.js";
 
 export function extractCustomEmojisFromMfm(nodes: mfm.MfmNode[]): string[] {
diff --git a/packages/backend/src/misc/extract-hashtags.ts b/packages/backend/src/misc/extract-hashtags.ts
index 826e36221b..ad8286089b 100644
--- a/packages/backend/src/misc/extract-hashtags.ts
+++ b/packages/backend/src/misc/extract-hashtags.ts
@@ -1,4 +1,4 @@
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import { unique } from "@/prelude/array.js";
 
 export function extractHashtags(nodes: mfm.MfmNode[]): string[] {
diff --git a/packages/backend/src/misc/extract-mentions.ts b/packages/backend/src/misc/extract-mentions.ts
index 259f78e576..8c18157623 100644
--- a/packages/backend/src/misc/extract-mentions.ts
+++ b/packages/backend/src/misc/extract-mentions.ts
@@ -1,6 +1,6 @@
 // test is located in test/extract-mentions
 
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 
 export function extractMentions(
 	nodes: mfm.MfmNode[],
diff --git a/packages/backend/src/models/repositories/note.ts b/packages/backend/src/models/repositories/note.ts
index 453179bd6f..ee7ea8f6d5 100644
--- a/packages/backend/src/models/repositories/note.ts
+++ b/packages/backend/src/models/repositories/note.ts
@@ -1,5 +1,5 @@
 import { In } from "typeorm";
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import { Note } from "@/models/entities/note.js";
 import type { User } from "@/models/entities/user.js";
 import {
diff --git a/packages/backend/src/remote/activitypub/misc/get-note-html.ts b/packages/backend/src/remote/activitypub/misc/get-note-html.ts
index cb5294f731..6a2593cd1c 100644
--- a/packages/backend/src/remote/activitypub/misc/get-note-html.ts
+++ b/packages/backend/src/remote/activitypub/misc/get-note-html.ts
@@ -1,4 +1,4 @@
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import type { Note } from "@/models/entities/note.js";
 import { toHtml } from "../../../mfm/to-html.js";
 
diff --git a/packages/backend/src/remote/activitypub/models/note.ts b/packages/backend/src/remote/activitypub/models/note.ts
index 391f669f3f..9002b2b5f1 100644
--- a/packages/backend/src/remote/activitypub/models/note.ts
+++ b/packages/backend/src/remote/activitypub/models/note.ts
@@ -1,5 +1,5 @@
 import promiseLimit from "promise-limit";
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import config from "@/config/index.js";
 import Resolver from "../resolver.js";
 import post from "@/services/note/create.js";
diff --git a/packages/backend/src/remote/activitypub/renderer/person.ts b/packages/backend/src/remote/activitypub/renderer/person.ts
index 1122a3a279..15e262ad65 100644
--- a/packages/backend/src/remote/activitypub/renderer/person.ts
+++ b/packages/backend/src/remote/activitypub/renderer/person.ts
@@ -1,5 +1,5 @@
 import { URL } from "node:url";
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import config from "@/config/index.js";
 import type { ILocalUser } from "@/models/entities/user.js";
 import { DriveFiles, UserProfiles } from "@/models/index.js";
diff --git a/packages/backend/src/server/api/endpoints/i/update.ts b/packages/backend/src/server/api/endpoints/i/update.ts
index 6d3bde2b8d..1c69c36bbf 100644
--- a/packages/backend/src/server/api/endpoints/i/update.ts
+++ b/packages/backend/src/server/api/endpoints/i/update.ts
@@ -1,5 +1,5 @@
 import RE2 from "re2";
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import { publishMainStream, publishUserEvent } from "@/services/stream.js";
 import acceptAllFollowRequests from "@/services/following/requests/accept-all.js";
 import { publishToFollowers } from "@/services/i/update.js";
diff --git a/packages/backend/src/server/api/endpoints/notes/edit.ts b/packages/backend/src/server/api/endpoints/notes/edit.ts
index 70c5ceffb4..b9c448cb37 100644
--- a/packages/backend/src/server/api/endpoints/notes/edit.ts
+++ b/packages/backend/src/server/api/endpoints/notes/edit.ts
@@ -21,7 +21,7 @@ import define from "../../define.js";
 import { HOUR } from "@/const.js";
 import { getNote } from "../../common/getters.js";
 import { Poll } from "@/models/entities/poll.js";
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import { concat } from "@/prelude/array.js";
 import { extractHashtags } from "@/misc/extract-hashtags.js";
 import { extractCustomEmojisFromMfm } from "@/misc/extract-custom-emojis-from-mfm.js";
diff --git a/packages/backend/src/services/note/create.ts b/packages/backend/src/services/note/create.ts
index 689bd66162..16312b9bd7 100644
--- a/packages/backend/src/services/note/create.ts
+++ b/packages/backend/src/services/note/create.ts
@@ -1,4 +1,4 @@
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import es from "../../db/elasticsearch.js";
 import sonic from "../../db/sonic.js";
 import {
diff --git a/packages/backend/test/extract-mentions.ts b/packages/backend/test/extract-mentions.ts
index f400e1e634..7525242fbc 100644
--- a/packages/backend/test/extract-mentions.ts
+++ b/packages/backend/test/extract-mentions.ts
@@ -1,6 +1,6 @@
 import * as assert from "assert";
 
-import { parse } from "mfm-js";
+import { parse } from "ffm-js";
 import { extractMentions } from "../src/misc/extract-mentions.js";
 
 describe("Extract mentions", () => {
diff --git a/packages/backend/test/mfm.ts b/packages/backend/test/mfm.ts
index 926bdd259d..fc4a01f47e 100644
--- a/packages/backend/test/mfm.ts
+++ b/packages/backend/test/mfm.ts
@@ -1,5 +1,5 @@
 import * as assert from "assert";
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 
 import { toHtml } from "../src/mfm/to-html.js";
 import { fromHtml } from "../src/mfm/from-html.js";
diff --git a/packages/client/src/components/MkNote.vue b/packages/client/src/components/MkNote.vue
index b1c6114e1f..40f014a568 100644
--- a/packages/client/src/components/MkNote.vue
+++ b/packages/client/src/components/MkNote.vue
@@ -256,7 +256,7 @@
 
 <script lang="ts" setup>
 import { computed, inject, onMounted, ref } from "vue";
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import type { Ref } from "vue";
 import type * as misskey from "firefish-js";
 import MkNoteSub from "@/components/MkNoteSub.vue";
diff --git a/packages/client/src/components/MkPostForm.vue b/packages/client/src/components/MkPostForm.vue
index a65f48d568..81869a7975 100644
--- a/packages/client/src/components/MkPostForm.vue
+++ b/packages/client/src/components/MkPostForm.vue
@@ -242,7 +242,7 @@ import {
 	ref,
 	computed,
 } from "vue";
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import * as misskey from "firefish-js";
 import autosize from "autosize";
 import insertTextAtCursor from "insert-text-at-cursor";
diff --git a/packages/client/src/components/MkSubNoteContent.vue b/packages/client/src/components/MkSubNoteContent.vue
index 2ffc9483b7..7933ef90ab 100644
--- a/packages/client/src/components/MkSubNoteContent.vue
+++ b/packages/client/src/components/MkSubNoteContent.vue
@@ -178,7 +178,7 @@
 <script lang="ts" setup>
 import { ref } from "vue";
 import * as misskey from "firefish-js";
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import * as os from "@/os";
 import XNoteSimple from "@/components/MkNoteSimple.vue";
 import XMediaList from "@/components/MkMediaList.vue";
diff --git a/packages/client/src/components/MkUrlPreview.vue b/packages/client/src/components/MkUrlPreview.vue
index f7326caf2b..e7a141339d 100644
--- a/packages/client/src/components/MkUrlPreview.vue
+++ b/packages/client/src/components/MkUrlPreview.vue
@@ -135,7 +135,7 @@ const embedId = `embed${Math.random().toString().replace(/\D/, "")}`;
 let tweetHeight = ref(150);
 
 const requestUrl = new URL(props.url);
-if (!["http:", "https:"].includes(requestUrl.protocol))
+if (!["http:", "https:", "gopher:", "gemini:", "matrix:"].includes(requestUrl.protocol))
 	throw new Error("invalid url");
 
 if (
diff --git a/packages/client/src/components/global/MkUrl.vue b/packages/client/src/components/global/MkUrl.vue
index 41bb053926..9e6c29f68d 100644
--- a/packages/client/src/components/global/MkUrl.vue
+++ b/packages/client/src/components/global/MkUrl.vue
@@ -11,14 +11,14 @@
 		@click.stop
 	>
 		<template v-if="!self">
-			<span class="schema">{{ schema }}//</span>
-			<span class="hostname">{{ hostname }}</span>
+			<span class="schema">{{ schema }}{{ hostname.trim() != '' ? '//' : '' }}</span>
+			<span class="hostname">{{ hostname.trim() != '' ? hostname.trim() : pathname }}</span>
 			<span v-if="port != ''" class="port">:{{ port }}</span>
 		</template>
 		<template v-if="pathname === '/' && self">
 			<span class="self">{{ hostname }}</span>
 		</template>
-		<span v-if="pathname != ''" class="pathname">{{
+		<span v-if="pathname != '' && !!hostname" class="pathname">{{
 			self ? pathname.substring(1) : pathname
 		}}</span>
 		<span class="query">{{ query }}</span>
@@ -45,7 +45,7 @@ const props = defineProps<{
 
 const self = props.url.startsWith(local);
 const url = new URL(props.url);
-if (!["http:", "https:"].includes(url.protocol)) throw new Error("invalid url");
+if (!["http:", "https:", "gopher:", "gemini:", "matrix:"].includes(url.protocol)) throw new Error("invalid url");
 const el = ref();
 
 useTooltip(el, (showing) => {
diff --git a/packages/client/src/components/mfm.ts b/packages/client/src/components/mfm.ts
index cb0942a338..3f379218e8 100644
--- a/packages/client/src/components/mfm.ts
+++ b/packages/client/src/components/mfm.ts
@@ -1,5 +1,5 @@
 import { defineComponent, h } from "vue";
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import type { VNode } from "vue";
 import MkUrl from "@/components/global/MkUrl.vue";
 import MkLink from "@/components/MkLink.vue";
diff --git a/packages/client/src/components/page/page.text.vue b/packages/client/src/components/page/page.text.vue
index 72854bf39a..24f67adb71 100644
--- a/packages/client/src/components/page/page.text.vue
+++ b/packages/client/src/components/page/page.text.vue
@@ -9,7 +9,7 @@
 import { TextBlock } from "@/scripts/hpml/block";
 import { Hpml } from "@/scripts/hpml/evaluator";
 import { defineAsyncComponent, defineComponent, PropType } from "vue";
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import { extractUrlFromMfm } from "@/scripts/extract-url-from-mfm";
 export default defineComponent({
 	components: {
diff --git a/packages/client/src/pages/messaging/messaging-room.message.vue b/packages/client/src/pages/messaging/messaging-room.message.vue
index 7c9a337da9..b49b3f4ed1 100644
--- a/packages/client/src/pages/messaging/messaging-room.message.vue
+++ b/packages/client/src/pages/messaging/messaging-room.message.vue
@@ -85,7 +85,7 @@
 import { computed } from "vue";
 
 import {} from "vue";
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import type * as Misskey from "firefish-js";
 import XMediaList from "@/components/MkMediaList.vue";
 import { extractUrlFromMfm } from "@/scripts/extract-url-from-mfm";
diff --git a/packages/client/src/scripts/extract-mentions.ts b/packages/client/src/scripts/extract-mentions.ts
index 259f78e576..8c18157623 100644
--- a/packages/client/src/scripts/extract-mentions.ts
+++ b/packages/client/src/scripts/extract-mentions.ts
@@ -1,6 +1,6 @@
 // test is located in test/extract-mentions
 
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 
 export function extractMentions(
 	nodes: mfm.MfmNode[],
diff --git a/packages/client/src/scripts/extract-mfm.ts b/packages/client/src/scripts/extract-mfm.ts
index c62547cdbc..e8696e1cc2 100644
--- a/packages/client/src/scripts/extract-mfm.ts
+++ b/packages/client/src/scripts/extract-mfm.ts
@@ -1,4 +1,4 @@
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 
 const animatedMfm = [
 	"tada",
diff --git a/packages/client/src/scripts/extract-url-from-mfm.ts b/packages/client/src/scripts/extract-url-from-mfm.ts
index 0c580b6d32..a734e2645c 100644
--- a/packages/client/src/scripts/extract-url-from-mfm.ts
+++ b/packages/client/src/scripts/extract-url-from-mfm.ts
@@ -1,4 +1,4 @@
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import { unique } from "@/scripts/array";
 
 // unique without hash
diff --git a/packages/client/src/scripts/preprocess.ts b/packages/client/src/scripts/preprocess.ts
index 438a44d30a..1f5f875f36 100644
--- a/packages/client/src/scripts/preprocess.ts
+++ b/packages/client/src/scripts/preprocess.ts
@@ -1,4 +1,4 @@
-import * as mfm from "mfm-js";
+import * as mfm from "ffm-js";
 import { defaultStore } from "@/store";
 import { expandKaTeXMacro } from "@/scripts/katex-macro";
 
diff --git a/packages/client/vite.config.ts b/packages/client/vite.config.ts
index 90f75b66cf..9a39b230d4 100644
--- a/packages/client/vite.config.ts
+++ b/packages/client/vite.config.ts
@@ -89,7 +89,7 @@ export default defineConfig(({ command, mode }) => {
 			sourcemap: process.env.NODE_ENV === "development",
 			reportCompressedSize: false,
 			commonjsOptions: {
-				include: [/firefish-js/, /node_modules/],
+				include: [/firefish-js/, /ffm-js/, /node_modules/],
 			},
 		},
 		optimizeDeps: {
diff --git a/packages/ffm-js/package.json b/packages/ffm-js/package.json
index 620a400d47..1dfa06cd03 100644
--- a/packages/ffm-js/package.json
+++ b/packages/ffm-js/package.json
@@ -1,7 +1,7 @@
 {
   "name": "ffm-js",
   "version": "0.23.3",
-  "description": "An MFM parser implementation with TypeScript",
+  "description": "An FFM parser implementation with TypeScript",
   "main": "./built/index.js",
   "types": "./built/index.d.ts",
   "scripts": {
diff --git a/packages/ffm-js/src/internal/parser.ts b/packages/ffm-js/src/internal/parser.ts
index 0d19f27291..e37bbcde44 100644
--- a/packages/ffm-js/src/internal/parser.ts
+++ b/packages/ffm-js/src/internal/parser.ts
@@ -674,7 +674,7 @@ export const language = P.createLanguage({
 		]));
 		const parser = P.seq([
 			notLinkLabel,
-			P.regexp(/https?:\/\//),
+			P.regexp(/((https?)|(gemini)|(gopher)|(matrix)):\/\//),
 			innerItem.many(1).text(),
 		]);
 		return new P.Parser<M.MfmUrl | string>((input, index, state) => {
@@ -706,7 +706,7 @@ export const language = P.createLanguage({
 		const parser = P.seq([
 			notLinkLabel,
 			open,
-			P.regexp(/https?:\/\//),
+			P.regexp(/((https?)|(gemini)|(gopher)|(matrix)):\/\//),
 			P.seq([P.notMatch(P.alt([close, space])), P.char], 1).many(1),
 			close,
 		]).text();
diff --git a/packages/ffm-js/test/parser.ts b/packages/ffm-js/test/parser.ts
index 50ae7007e0..4d1e062eab 100644
--- a/packages/ffm-js/test/parser.ts
+++ b/packages/ffm-js/test/parser.ts
@@ -912,6 +912,14 @@ hoge`;
 			assert.deepStrictEqual(mfm.parse(input), output);
 		});
 
+		test('gopher', () => {
+			const input = 'gopher://misskey.io/@ai';
+			const output = [
+				N_URL('gopher://misskey.io/@ai'),
+			];
+			assert.deepStrictEqual(mfm.parse(input), output);
+		});
+
 		test('with other texts', () => {
 			const input = 'official instance: https://misskey.io/@ai.';
 			const output = [