The newer version have been ported to esm, but I haven't figured out
how to make that work with rollup.

See https://datatables.net/blog/2022-11-10-esm

See https://github.com/emn178/js-sha256/issues/18

We don't require npm to be installed

The old version is no longer maintained and doesn't support rollup v3

It has new API which we want to use.

Newest Ubuntu switched Firefox to a snap, which breaks karma.

Try to use playwright to download and cache firefox/chromium
and use those for karma.

Compared to puppeteer where we did this some time ago this caches
the browsers globally, and only downloads them when we start the tests.