Keep DRM off your computer. Firefox updated to version 38 today, and it comes with DRM built in (without which, I’m told, you can’t watch Neflix).
The link above is to the US-English version of Firefox. Here’s the multi-lingual index to other language DRM-free versions of Firefox.
You can install this instead of the ver 38 update, or on top of it. In my experience it remembers all your customizations, such as plugins.
(Image from L[P]SI Blog)