For me it works fine, but I guess that might be because I use the flatpak version of Firefox.

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For general usage, it doesn’t really matter. Distrobox is inspired on toolbox and provides some added functionality and configurability, like init scripts and the ability to run different distros, as well as creating desktop shortcuts on your host system. If you don’t need all of that, I’d stick with toolbox, as it’s preinstalled and works well.

The regulation actually enforces that PD is implemented if high speed charging is available and that it can’t be limited in speed compared to any other charging protocol that’s also available on the device, irrespective of the charging device used.

We don’t need to guess if we can just read the regulation: https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32022L2380&qid=1691523718368.