I use Chromium/Firefox and Widevine … sometimes works. For example, Chromium recently broke Widevine support; this was the Gentoo thread about it at the time, IIRC: https://forums.gentoo.org/viewtopic-t-1080874-start-0.html.

So, switched to Firefox. Firefox then also had it break on Debian/Gentoo: https://bugzilla.mozilla.org/show_bug.cgi?id=1475260.

Chromium, and other FOSS browsers including Firefox, do support Widevine. It is a giant proprietary binary blob, yes, but there's support for it. (And yes, I wish everyone would adopt and obey the tenants of free software, but alas.)