diff --git a/.forgejo/workflows/extension.yml b/.forgejo/workflows/extension.yml
new file mode 100644
index 0000000..c992410
--- /dev/null
+++ b/.forgejo/workflows/extension.yml
@@ -0,0 +1,61 @@
+name: extension
+on:
+  push:
+    branches: [dev, main]
+    paths: ['extension/**']
+  workflow_dispatch:
+
+jobs:
+  lint:
+    runs-on: python-ci
+    container:
+      image: node:22-bookworm-slim
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install web-ext
+        run: cd extension && npm install --no-save --no-audit --no-fund
+      - name: Lint
+        run: cd extension && npm run lint
+
+  sign-and-publish:
+    needs: lint
+    if: github.ref == 'refs/heads/main'
+    runs-on: python-ci
+    container:
+      image: node:22-bookworm-slim
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.RELEASE_TOKEN }}
+      - name: Install web-ext + git
+        run: |
+          apt-get update && apt-get install -y --no-install-recommends git ca-certificates
+          cd extension && npm install --no-save --no-audit --no-fund
+      - name: Sign XPI
+        run: cd extension && npm run sign
+        env:
+          WEB_EXT_API_KEY: ${{ secrets.MOZILLA_AMO_JWT_KEY }}
+          WEB_EXT_API_SECRET: ${{ secrets.MOZILLA_AMO_JWT_SECRET }}
+      - name: Commit signed XPI to frontend/public/extension/
+        run: |
+          set -e
+          XPI=$(ls extension/web-ext-artifacts/fabledcurator-*.xpi | head -1)
+          if [ -z "$XPI" ]; then
+            echo "No XPI produced by web-ext sign — exiting"
+            exit 1
+          fi
+          mkdir -p frontend/public/extension
+          cp "$XPI" frontend/public/extension/
+          # Also copy as -latest.xpi so the FC server can serve a stable URL.
+          cp "$XPI" "frontend/public/extension/fabledcurator-latest.xpi"
+          git config user.name  "FC extension CI"
+          git config user.email "noreply@fabledsword.com"
+          git add frontend/public/extension/
+          if git diff --cached --quiet; then
+            echo "No changes to commit"
+          else
+            git commit -m "ext: publish signed XPI $(basename $XPI)
+
+Co-Authored-By: FC extension CI <noreply@fabledsword.com>"
+            git push origin HEAD:main
+          fi