This is a mistake. uMatrix will block requests which would pull source code, but it does not stop script execution, i.e. those embedded in the page itself. NoScript stops script execution completely.
NoScript also activates `<noscript>` tags which will allow content to render on Medium. And which break Twitter by redirecting away just after it loads...
Caveat emptor: NoScript is somewhat buggy in its WebExt form. Sometimes it needs a click on the global revoke button to render `<noscript>` again. Sometimes it pops up blank windows. I'm not aware of any alternative though.