Or for something you can run from command line, with no browser required (which may be a pro or a con, depending on your perspective), check https://github.com/

Or for something you can run from command line, with no browser required (which may be a pro or a con, depending on your perspective), check https://github.com/operasoftware/ucss https://github.com/operasoftware/ucss. (Disclaimer: I wrote it.)