diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..787d5c1
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,49 @@
+#!/usr/bin/env bash
+###############################################################################
+# build.sh — génère dist/chromium/, dist/firefox/, et les archives .zip / .xpi
+# à partir du code source dans src/.
+#
+# Usage : ./build.sh
+###############################################################################
+set -e
+cd "$(dirname "$0")"
+
+VERSION=$(python3 -c "import json; print(json.load(open('src/manifest.json'))['version'])")
+echo "==> Build Planification v$VERSION"
+
+rm -rf dist
+mkdir -p dist/chromium dist/firefox
+
+# ---- Chromium : copie src/ tel quel (manifest sans gecko_settings) ----
+cp -r src/* dist/chromium/
+echo "  ✓ dist/chromium/ ($(du -sh dist/chromium | cut -f1))"
+
+# ---- Firefox : copie src/ + manifest avec browser_specific_settings ----
+cp -r src/* dist/firefox/
+python3 - <<EOF
+import json
+with open('src/manifest.json', 'r') as f: m = json.load(f)
+m['browser_specific_settings'] = {
+  'gecko': {
+    'id': 'planification@netaplaid.ch',
+    'strict_min_version': '140.0',
+    'update_url': 'https://gitea.netaplaid.ch/FroSteel/Planification/raw/branch/main/firefox-updates.json',
+    'data_collection_permissions': {'required': ['none']}
+  }
+}
+with open('dist/firefox/manifest.json', 'w') as f:
+  json.dump(m, f, indent=2, ensure_ascii=False)
+  f.write('\n')
+EOF
+echo "  ✓ dist/firefox/ ($(du -sh dist/firefox | cut -f1))"
+
+# ---- Archives ZIP / XPI prêtes à distribuer ----
+cd dist/chromium && zip -rq "../planification-v${VERSION}-chromium.zip" . && cd ../..
+cd dist/firefox  && zip -rq "../planification-v${VERSION}-firefox.xpi" . && cd ../..
+
+echo ""
+echo "==> Builds prêts dans dist/"
+ls -la dist/*.zip dist/*.xpi 2>/dev/null
+echo ""
+echo "Pour Chrome  : charger dist/chromium/ en mode développeur"
+echo "Pour Firefox : signer dist/planification-v${VERSION}-firefox.xpi sur AMO"
diff --git a/background.js b/src/background.js
similarity index 100%
rename from background.js
rename to src/background.js
diff --git a/icons/icon128.png b/src/icons/icon128.png
similarity index 100%
rename from icons/icon128.png
rename to src/icons/icon128.png
diff --git a/icons/icon16.png b/src/icons/icon16.png
similarity index 100%
rename from icons/icon16.png
rename to src/icons/icon16.png
diff --git a/icons/icon48.png b/src/icons/icon48.png
similarity index 100%
rename from icons/icon48.png
rename to src/icons/icon48.png
diff --git a/manifest.json b/src/manifest.json
similarity index 100%
rename from manifest.json
rename to src/manifest.json
diff --git a/viewer.css b/src/viewer.css
similarity index 100%
rename from viewer.css
rename to src/viewer.css
diff --git a/viewer.html b/src/viewer.html
similarity index 100%
rename from viewer.html
rename to src/viewer.html
diff --git a/viewer.js b/src/viewer.js
similarity index 100%
rename from viewer.js
rename to src/viewer.js