Version 0.4.0 adds offline EPUB support with improved layout, images, fonts, and EPUB stylesheet rendering. Also improves Chrome and Firefox compatibility.

Added Firefox/Mozilla Add-ons compatibility.
Added source-code viewing mode.
Added offline-only mode for local Markdown files.
Added full-page-width viewing.
Excluded GitHub’s native Markdown pages.
Added correctly sized extension icons.
Improved security and browser compatibility.