Hides Wikipedia's left sidebar by default, with a small button in the top-left to toggle it. Adapted from Better Wikipedia by Sin Jeong-hun.
Does not hide the sidebar on other Wikimedia sites (e.g. Wiktionary, Wikibooks). Does not remember state across pages. The sidebar will always start hidden when you load a page.
Fixed extension not working when viewing revision history and some other pages. (Added *.wikipedia.org/w/* to list of matches, previously only had *.wikipedia.org/wiki/*)
