test: Also run firefox & webkit automated tests (#2651)

.prettierignore

@@ -1,2 +1,10 @@
+# Third party libraries, shipped minified: formatting them would rewrite code #
+# that is not ours to style.
 docs/js/
+
+# Home Assistant's own files, which it writes and reads back for itself.
 .devcontainer/
+
+# Generated by `msw init` and copied here again on every install, so any #
+# formatting would be undone. See tests/browser/public/README.md .
+tests/browser/public/mockServiceWorker.js