diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index c9bdef3..d812456 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -52,6 +52,29 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Extract version from tag
+        id: version
+        run: echo "VERSION=${GITHUB_REF_NAME#v}" >> $GITHUB_OUTPUT
+
+      - name: Inject version into source files
+        run: |
+          VERSION=${{ steps.version.outputs.VERSION }}
+          echo "Injecting version $VERSION from tag $GITHUB_REF_NAME..."
+
+          # 1. extension/manifest.base.json
+          jq --arg v "$VERSION" '.version = $v' extension/manifest.base.json > tmp.json && mv tmp.json extension/manifest.base.json
+          echo "  ✓ manifest.base.json -> $VERSION"
+
+          # 2. shared/constants.js — APP_VERSION
+          sed -i "s/export const APP_VERSION = '.*'/export const APP_VERSION = '$VERSION'/" shared/constants.js
+          echo "  ✓ shared/constants.js -> $VERSION"
+
+          # 3. package.json
+          jq --arg v "$VERSION" '.version = $v' package.json > tmp.json && mv tmp.json package.json
+          echo "  ✓ package.json -> $VERSION"
+
+          echo "Version injection complete."
+
       - name: Build Extensions
         run: |
           npm install
diff --git a/.gitignore b/.gitignore
index 566f25c..f7fb0ab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,8 +38,7 @@ coverage/
 # KoalaSync Specific
 # We ignore the synced files in the extension folder to ensure 
 # the root 'shared/' remains the Single Source of Truth.
-extension/shared/*
-!extension/shared/README.md
+extension/shared/
 
 # Temporary scratch files
 scratch/
diff --git a/AI_INIT.md b/AI_INIT.md
index 8b2d2e4..13923f3 100644
--- a/AI_INIT.md
+++ b/AI_INIT.md
@@ -15,7 +15,7 @@ KoalaSync is a specialized tool for **synchronized video playback** across multi
 - **Identity**: Users are identified by a unique hex `peerId` combined with a customizable `username`.
 
 ## 2. Repository Structure
-- `extension/`: Chrome Extension (Manifest V3). Contains background service worker, content scripts, and popup UI.
+- `extension/`: Browser Extension (Chrome & Firefox, Manifest V3). Contains background service worker, content scripts, and popup UI.
 - `server/`: Node.js Relay Server using Socket.IO (WebSocket-only).
 - `website/`: **Landing Page** & Invitation Bridge (Marketing, Tutorials, and Downloads).
 - `shared/`: **Single Source of Truth** for protocol constants and event names.
@@ -86,12 +86,11 @@ The following features are critical and must not be removed or fundamentally alt
 ### Releasing a New Version (CRITICAL WORKFLOW FOR AI AGENTS)
 > [!CAUTION]
 > **AI AGENTS MUST FOLLOW THIS EXACT SEQUENCE WHEN RELEASING A NEW VERSION OR TAGGING.**
-> The extension version is read from the `manifest.json` and `constants.js`, NOT the Git tag. If you skip steps 1-3, the release will contain the old version numbers.
-1. **Update `version`** in `extension/manifest.json`.
-2. **Update `APP_VERSION`** in `shared/constants.js`.
-3. Commit these changes with message `chore: bump version to X.X.X` and push to `main`.
-4. Create and push a new tag. **MANDATORY**: Tags MUST start with a `v` (e.g., `v1.3.1`). The GitHub Actions release workflow is strictly configured to ignore any tags without the `v` prefix.
-5. Verify the release builds on GitHub Actions.
+> The CI pipeline automatically injects the version from the git tag into `manifest.base.json`, `shared/constants.js`, and `package.json`. You do NOT need to manually bump version numbers.
+1. Commit all code changes and push to `main`.
+2. Create and push a new tag. **MANDATORY**: Tags MUST start with a `v` (e.g., `v1.4.0`). The GitHub Actions release workflow is strictly configured to ignore any tags without the `v` prefix.
+3. The CI will extract the version from the tag (e.g., `v1.4.0` → `1.4.0`), inject it into all source files, build the extension artifacts, publish the Docker image, and create a GitHub Release.
+4. Verify the release builds on GitHub Actions.
 
 ### Adding a Protocol Event
 1. Add the event name to `shared/constants.js`.
diff --git a/extension/shared/README.md b/extension/shared/README.md
deleted file mode 100644
index 33cfe6f..0000000
--- a/extension/shared/README.md
+++ /dev/null
@@ -1,14 +0,0 @@
-# ⚠️ READ BEFORE EDITING
-
-This directory is a **MIRROR** of the root `/shared` folder.
-
-**DO NOT edit these files directly.** Any changes made here will be overwritten the next time the synchronization script is run.
-
-### Proper Workflow:
-1.  **Edit** the source files in the root `[repo_root]/shared/` directory.
-2.  **Run** the synchronization script:
-    -   **Windows**: `[repo_root]\scripts\sync-constants.bat`
-    -   **Linux/macOS**: `[repo_root]/scripts/sync-constants.sh`
-3.  **Verify** that the changes have propagated to this folder.
-
-Failure to follow this protocol will result in out-of-sync components and broken protocol logic.
diff --git a/scripts/build-extension.js b/scripts/build-extension.js
index 96e68c7..6b439e5 100644
--- a/scripts/build-extension.js
+++ b/scripts/build-extension.js
@@ -22,7 +22,7 @@ if (!fs.existsSync(extSharedDir)) {
   fs.mkdirSync(extSharedDir, { recursive: true });
 }
 
-const sharedFiles = ['constants.js', 'blacklist.js'];
+const sharedFiles = ['constants.js', 'blacklist.js', 'README.md'];
 for (const file of sharedFiles) {
   const src = path.join(masterSharedDir, file);
   const dest = path.join(extSharedDir, file);
@@ -31,7 +31,7 @@ for (const file of sharedFiles) {
   }
   fs.copyFileSync(src, dest);
 }
-console.log('✓ constants.js and blacklist.js synced to extension/shared/');
+console.log('✓ constants.js, blacklist.js, and README.md synced to extension/shared/');
 
 // Read the base manifest
 const baseManifest = JSON.parse(fs.readFileSync(baseManifestPath, 'utf8'));