A Wikipedia skin that focuses on readability: Comfortable line-width, larger text, better typography, less visual noise, darkened colours.

All menus are hidden by default: Move your mouse over to the left edge of your browser to bring back the navigation sidebar; move it up to the grey area on top to bring back the main article links.

New feature as of version v0.9.9: Hidden Table of Contents: Move your mouse to the right edge of the browser window to show it. (And yes, i know, it's somewhat broken for smaller screens. I'm looking for a fix.)

Also, this skin adds numbers to the headlines, via http://freestyler.ws/style/50181/wikipedia-readable-hyphenation by Lupurus@userstyles.

Note: This skin focuses on the English Wikipedia, with a few fixes for the German one. But it should be mostly fine in any language.

Read more about it here: http://fav.me/d7b8hap
Inspired by this article by "1910": http://blog.weare1910.com/post/75576312730/a-readable-wikipedia