There is actually a draft of media query called "reduced motion" that tells webpage that user prefers to have animation use set to minimum. It wasn't created to save energy but to help people that feel dizzy when too much of animation is going on.
https://webkit.org/blog/7551/responsive-design-for-motion/#u...
Other nice to have option would be to just force disable rendering all animation by browser itself.
If you're on a Mac then i can recommend Dash app for offline docs libraries.
For me it's completely different experience to code offline (very enjoyable). More thinking involved - less Google/SO.
You can do more and more with Facebook Account it's just just scary to lose control over my profile.