Chrome Widevine DRM can no longer be disabled
This + moving SSL certificate details dialog hidden away into devtools + no way to disable NaCl + chrome 56 auto-re-enabling flash and widevine on every launch (which shows a click-to-enable-flash everywhere chrome55 would just use a html5 video player) + the upcoming background tab throttling means I'll be seriously reconsidering firefox or safari before the next Chrome release :-/