Consider to support XSLT for XML (XSLT 1.0 and above) and JSON (XSLT 3.0 and above) documents See XSLT project DesignLiquido/xslt-processor/issues/132

It does it's job. That's great. But the boxes are too small to write code. It would be great if I could code on a full page editor like the extension in Chrome (User Javascript and CSS) does.
Good for small teaks.