diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index edd5b9e..59f6b5a 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -1,4 +1,4 @@
-name: "Publish to Chrome Web Store"
+name: "Publish to Extension Store"
 on:
   push:
     branches:
@@ -64,12 +64,12 @@ jobs:
         run: npx changeset tag
 
       - name: Build the extension
-        run: npm run build
+        run: npm run build && npm run build:firefox
 
       - name: Package the extension into a zip artifact
-        run: npm run package
+        run: npm run package && npm run package:firefox
 
-      - name: Publish to Chrome Web Store
+      - name: Publish to Extension Store
         uses: PlasmoHQ/bpp@v3
         with:
           keys: ${{ secrets.PUBLISH_KEYS }}
diff --git a/README.md b/README.md
index cefcfa0..ed5aba1 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ https://github.com/kawamataryo/sky-follower-bridge/assets/11070996/0c87f9b9-573f
 
 ## 📦 Installation
 - [Chrome Web Store](https://chrome.google.com/webstore/detail/sky-follower-bridge/behhbpbpmailcnfbjagknjngnfdojpko)
+- [Firefox Add-ons](https://addons.mozilla.org/ja/firefox/addon/sky-follower-bridge/)
 
 ## 🚀 How to use
 1.	Open your Twitter [Follower](https://twitter.com/following) or [Follow](https://twitter.com/followers) or [list members](), [blocking](https://twitter.com/settings/blocked/all) page.
diff --git a/src/background/messages/block.ts b/src/background/messages/block.ts
new file mode 100644
index 0000000..9294b03
--- /dev/null
+++ b/src/background/messages/block.ts
@@ -0,0 +1,13 @@
+import type { PlasmoMessaging } from "@plasmohq/messaging"
+import { BskyClient } from "~lib/bskyClient";
+
+const handler: PlasmoMessaging.MessageHandler = async (req, res) => {
+  const { session, subjectDid }  = req.body
+  const client = BskyClient.createAgentFromSession(session)
+
+  res.send({
+    result: await client.block(subjectDid)
+  })
+}
+
+export default handler
diff --git a/src/background/messages/follow.ts b/src/background/messages/follow.ts
new file mode 100644
index 0000000..cd291e1
--- /dev/null
+++ b/src/background/messages/follow.ts
@@ -0,0 +1,13 @@
+import type { PlasmoMessaging } from "@plasmohq/messaging"
+import { BskyClient } from "~lib/bskyClient";
+
+const handler: PlasmoMessaging.MessageHandler = async (req, res) => {
+  const { session, subjectDid }  = req.body
+  const client = BskyClient.createAgentFromSession(session)
+
+  res.send({
+    result: await client.follow(subjectDid)
+  })
+}
+
+export default handler
diff --git a/src/background/messages/login.ts b/src/background/messages/login.ts
new file mode 100644
index 0000000..3833700
--- /dev/null
+++ b/src/background/messages/login.ts
@@ -0,0 +1,17 @@
+import type { PlasmoMessaging } from "@plasmohq/messaging"
+import { BskyClient } from "../../lib/bskyClient";
+
+const handler: PlasmoMessaging.MessageHandler = async (req, res) => {
+  const { identifier, password }  = req.body
+
+  const agent = await BskyClient.createAgent({
+    identifier,
+    password,
+  })
+
+  res.send({
+    session: agent.session,
+  })
+}
+
+export default handler
diff --git a/src/background/messages/searchUser.ts b/src/background/messages/searchUser.ts
new file mode 100644
index 0000000..40315b0
--- /dev/null
+++ b/src/background/messages/searchUser.ts
@@ -0,0 +1,16 @@
+import type { PlasmoMessaging } from "@plasmohq/messaging"
+import { BskyClient } from "~lib/bskyClient";
+
+const handler: PlasmoMessaging.MessageHandler = async (req, res) => {
+  const { session, term, limit }  = req.body
+  const client = BskyClient.createAgentFromSession(session)
+
+  res.send({
+    actors: await client.searchUser({
+      term,
+      limit,
+    })
+  })
+}
+
+export default handler
diff --git a/src/background/messages/unblock.ts b/src/background/messages/unblock.ts
new file mode 100644
index 0000000..166176a
--- /dev/null
+++ b/src/background/messages/unblock.ts
@@ -0,0 +1,13 @@
+import type { PlasmoMessaging } from "@plasmohq/messaging"
+import { BskyClient } from "~lib/bskyClient";
+
+const handler: PlasmoMessaging.MessageHandler = async (req, res) => {
+  const { session, blockUri }  = req.body
+  const client = BskyClient.createAgentFromSession(session)
+
+  res.send({
+    result: await client.unblock(blockUri)
+  })
+}
+
+export default handler
diff --git a/src/background/messages/unfollow.ts b/src/background/messages/unfollow.ts
new file mode 100644
index 0000000..b876ed9
--- /dev/null
+++ b/src/background/messages/unfollow.ts
@@ -0,0 +1,13 @@
+import type { PlasmoMessaging } from "@plasmohq/messaging"
+import { BskyClient } from "~lib/bskyClient";
+
+const handler: PlasmoMessaging.MessageHandler = async (req, res) => {
+  const { session, followUri }  = req.body
+  const client = BskyClient.createAgentFromSession(session)
+
+  res.send({
+    result: await client.unfollow(followUri)
+  })
+}
+
+export default handler
diff --git a/src/content.ts b/src/content.ts
index ad71305..55b3cd3 100644
--- a/src/content.ts
+++ b/src/content.ts
@@ -1,8 +1,9 @@
-import { BskyClient, type BskyLoginParams } from "./lib/bskyClient";
+import { type BskyLoginParams } from "./lib/bskyClient";
 import type { PlasmoCSConfig } from "plasmo"
 import { MESSAGE_NAMES, VIEWER_STATE } from "~lib/constants";
 import "./style.content.css"
 import { searchAndInsertBskyUsers } from '~lib/searchAndInsertBskyUsers';
+import { BskyServiceWorkerClient } from "~lib/bskyServiceWorkerClient";
 
 export const config: PlasmoCSConfig = {
   matches: ["https://twitter.com/*", "https://x.com/*"],
@@ -15,10 +16,11 @@ const searchAndShowBskyUsers = async ({
   messageName,
 }: BskyLoginParams & { messageName: string }) => {
 
-  const agent = await BskyClient.createAgent({
+  const agent = await BskyServiceWorkerClient.createAgent({
     identifier,
     password,
-  })
+  });
+
   switch (messageName) {
     case MESSAGE_NAMES.SEARCH_BSKY_USER_ON_FOLLOW_PAGE:
       await searchAndInsertBskyUsers({
diff --git a/src/lib/bskyClient.ts b/src/lib/bskyClient.ts
index f7f5a29..c9fa788 100644
--- a/src/lib/bskyClient.ts
+++ b/src/lib/bskyClient.ts
@@ -1,4 +1,4 @@
-import {  AtUri, BskyAgent } from "@atproto/api";
+import {  AtUri, BskyAgent, type AtpSessionData } from "@atproto/api";
 
 export type BskyLoginParams = {
   identifier: string;
@@ -13,9 +13,24 @@ export class BskyClient {
     email: string;
   };
   agent: BskyAgent;
+  session = {}
 
   private constructor() {
-    this.agent = new BskyAgent({ service: this.service });
+    this.agent = new BskyAgent({ service: this.service, persistSession: (evt, session) => {
+      this.session = session
+    } });
+  }
+
+  public static createAgentFromSession(session: AtpSessionData): BskyClient {
+    const client = new BskyClient();
+    client.agent.resumeSession(session);
+    client.me = {
+      did: session.did,
+      handle: session.handle,
+      email: session.email,
+    }
+
+    return client;
   }
 
   public static async createAgent({
diff --git a/src/lib/bskyServiceWorkerClient.ts b/src/lib/bskyServiceWorkerClient.ts
new file mode 100644
index 0000000..b825982
--- /dev/null
+++ b/src/lib/bskyServiceWorkerClient.ts
@@ -0,0 +1,92 @@
+import { sendToBackground } from "@plasmohq/messaging";
+
+export type BskyLoginParams = {
+  identifier: string;
+  password: string;
+}
+
+export class BskyServiceWorkerClient {
+  private session = {}
+
+  private constructor() {
+  }
+
+  public static async createAgent({
+    identifier,
+    password,
+  }: BskyLoginParams): Promise<BskyServiceWorkerClient> {
+    const client = new BskyServiceWorkerClient();
+    const { session } = await sendToBackground({
+      name: "login",
+      body: {
+        identifier,
+        password,
+      }
+    })
+    client.session = session
+    return client;
+  }
+
+  public searchUser = async ({
+    term,
+    limit,
+  }: {
+    term: string;
+    limit: number;
+  }) => {
+    const { actors } = await sendToBackground({
+      name: "searchUser",
+      body: {
+        session: this.session,
+        term,
+        limit,
+      }
+    })
+    return actors;
+  };
+
+  public follow = async (subjectDid: string) => {
+    const { result } = await sendToBackground({
+      name: "follow",
+      body: {
+        session: this.session,
+        subjectDid
+      }
+    })
+    return result;
+  }
+
+  public unfollow = async (followUri: string) => {
+    const { result } = await sendToBackground({
+      name: "unfollow",
+      body: {
+        session: this.session,
+        followUri
+      }
+    })
+    return result;
+  }
+
+  public block = async (subjectDid: string) => {
+    const { result } = await sendToBackground({
+      name: "block",
+      body: {
+        session: this.session,
+        subjectDid
+      }
+    })
+    return result;
+  }
+
+  public unblock = async (blockUri: string) => {
+    // TODO: unblock is not working. Need to fix it.
+    const { result } = await sendToBackground({
+      name: "unblock",
+      body: {
+        session: this.session,
+        blockUri
+      }
+    })
+    return result;
+  }
+}
diff --git a/src/lib/searchAndInsertBskyUsers.ts b/src/lib/searchAndInsertBskyUsers.ts
index 8e330c3..e985797 100644
--- a/src/lib/searchAndInsertBskyUsers.ts
+++ b/src/lib/searchAndInsertBskyUsers.ts
@@ -5,6 +5,7 @@ import { debugLog } from "~lib/utils";
 import type { BskyClient } from './bskyClient';
 import type { ViewerState } from '@atproto/api/dist/client/types/app/bsky/actor/defs';
 import type { UserCellBtnLabel } from './components/BskyUserCell';
+import type { BskyServiceWorkerClient } from './bskyServiceWorkerClient';
 
 
 const notFoundUserCache = new Set<string>()
@@ -20,7 +21,7 @@ export const searchAndInsertBskyUsers = async (
     addQuery,
     removeQuery,
   }: {
-    agent: BskyClient,
+    agent: BskyServiceWorkerClient | BskyClient,
     userCellQueryParam: string,
     btnLabel: UserCellBtnLabel,
     statusKey: keyof ViewerState,