diff --git a/default/chromium/extensions/copy-url/manifest.json b/default/chromium/extensions/copy-url/manifest.json
index 3125369a..927fd2b0 100644
--- a/default/chromium/extensions/copy-url/manifest.json
+++ b/default/chromium/extensions/copy-url/manifest.json
@@ -3,6 +3,7 @@
   "name": "Copy URL",
   "version": "1.0",
   "description": "Copy current URL to clipboard, this extension is installed by Omarchy",
+  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxbOMKgGcG20uelP6lx5OnuafGP9gNR1ajzURuQ45tv/Is5sc1tn9ii9PsKxpzDzPL9Z5lAqrTFgEcKHyTJnZXAGOMIruB0odJ0BW6eoQ3rxaQ/fBK2yGN7FZAfygPOWHj+Fdrh2eYQ7Ap92Dmlz8x0ceGyais415KmeevVcPwS7jjHFd1bGBp17cEMOBQcOx/3zCnko1hGtCzSdyZQl3cNMebW/FGvmxlPUMLVfWhysfFUuzxMRRf58+/j0mo/9iKQ0uTuxbQ8+W64OmYOVR87IXYNgbo+hEtORjiQhVg1KzaBx1bZ6clQMv96W/xYy1cIzUA5yI9y7lNr7n9zKijwIDAQAB",
   "permissions": ["activeTab", "scripting", "notifications"],
   "icons": {
     "16": "icon.png",
diff --git a/test/shell.d/chromium-copy-url-test.sh b/test/shell.d/chromium-copy-url-test.sh
new file mode 100644
index 00000000..19c08c1f
--- /dev/null
+++ b/test/shell.d/chromium-copy-url-test.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+
+source "$(dirname "${BASH_SOURCE[0]}")/base-test.sh"
+
+export PATH="$ROOT/bin:$PATH"
+
+require_command jq
+require_command node
+
+copy_url_id=$(node - <<'JS' "$ROOT/default/chromium/extensions/copy-url/manifest.json"
+const crypto = require('crypto')
+const fs = require('fs')
+
+const manifest = JSON.parse(fs.readFileSync(process.argv[2], 'utf8'))
+const hash = crypto.createHash('sha256').update(Buffer.from(manifest.key, 'base64')).digest()
+const alphabet = 'abcdefghijklmnop'
+let id = ''
+
+for (const byte of hash.subarray(0, 16)) {
+  id += alphabet[byte >> 4]
+  id += alphabet[byte & 0x0f]
+}
+
+process.stdout.write(id)
+JS
+)
+
+[[ $copy_url_id == "bgpiichlckmfanooecilcjemknkcpngb" ]] ||
+  fail "copy-url extension manifest has the stable id" "$copy_url_id"
+pass "copy-url extension manifest has the stable id"