Firefox only supports DRM on Windows. I hadn't thought to use WINE for a Windows install of Firefox on Linux. Chrome's DRM support is cross-platform, but only in Google Chrome, not Chromium, which can complicate the installation depending on your platform/OS.
I hadn't seen that before. Looks like it covers the Flash side only based on some quick reading and your comment.
Any word on e.g. Netflix support for Firefox on Linux/BSD? Google Chrome bundles the DRM components with the browser, so as long as you can consume the .deb or .rpm package you're good.
Firefox recently introduced HTML5 DRM support[0] but it's only on Windows. I know they're looking to support other operating systems, but haven't heard anything.