Docufarm Firefox extension

I’m not crazy about opening files (.doc, .pdf, .ppt, etc) online. I would just rather everything happen fast and within the browser (unless I actually need to whole file, of course). I came across the Docufarm Firefox extension the other day. I’ve only tested it on a few files, but it seems like it solves my problem. It converts each page to an image and presents you with thumbnails of the document (example). The only downfall I’ve noticed so far is it lags just a bit when showing the larger page view. But that may be a small price to pay to keep it all within the browser.