fix: remove unsupported Firefox permission

scripts/test-manifests.js

@@ -0,0 +1,15 @@
+#!/usr/bin/env node
+const assert = require('assert');
+
+const chromium = require('../chromium/manifest.json');
+const firefox = require('../firefox/manifest.json');
+
+assert.equal(chromium.version, firefox.version, 'browser packages must use the same version');
+assert.equal(
+  firefox.permissions.includes('windows'),
+  false,
+  'Firefox does not accept the Chromium-only windows permission'
+);
+assert.equal(chromium.permissions.includes('windows'), true, 'Chromium still needs the windows permission');
+
+console.log('browser manifest compatibility tests passed');