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Extensions 
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Markdown Preview Plus
Converts and previews markdown files (.md, .markdown) to HTML(include TOC) right inside Chrome and support live reload
Asciidoctor.js Live Preview
Render AsciiDoc (.ad, .adoc, .asc, .asciidoc) as HTML inside your browser!
Sheets Preview
Offline spreadsheet preview. Open binary XLS (Microsoft Excel 95/97), XLSX, ODS OpenOffice files directly with this JavaScript app.
AVI, WMV, MOV Video Play Preview
This player can play media files including avi, wmv, mov. Play and decode media files directly from your browser without plugins.
Sheets Preview X
Enhancement of Sheets Preview. Open XLSX, XLS (Microsoft Excel 95/97), CSV files directly with this JavaScript app.
iTunes Preview Player
Want to listen to iTunes previews without having iTunes installed? This is for you.
Peek: Preview PDFs, Office files, and more
Preview documents, videos, music, and more with a mouse hover.
Markdown Preview Plus Dz特别版
Converts and previews markdown files (.md, .markdown) to HTML right inside Chrome.
dz改良版
Scroll Preview
Scroll Preview integrates a whole-page preview with scrollbar that inspired by Sublime Text's mini map.
Remote Preview
Remote Preview allows to preview any URL on large number of mobile devices simultaneously
Prototypo Web Preview
This extension allows you to use and synchronize font you create with Prototypo directly on your web site
Full Width GMail preview pane
Hides ads in the GMail Preview Pane labs feature and expands the email view to fill that space.
