Integrated PDF reader is one of the exciting features of the latest stable release of Google Chrome 6. This feature will help you to read PDF files without downloading them to your computer.

However, integrated PDF reader is disabled by default. You need to enable this feature to view PDF file. To do that, type about:plugins in the address bar of Chrome and hit Enter (see screenshot below).

You can see a list of plug-ins. Enable Chrome PDF Viewer from this list and restart your browser. And if you want to save the PDF file on your computer, just right click on the page and select save option.

Did you know you can undo a sent e-mail in Gmail? It’s a lesser known feature, but Google just made it even better than it was before. When it first launched, you were given a 5-second window during which you could hit “undo.”

Now that’s up to 30 seconds, Google Operating System discovered.

The feature is hidden from most users who don’t know where to look, so here’s a quick guide to avoiding social and workplace faux pas with the click of a button. Be aware that the feature is part of Gmail Labs, though. That means it’s still in testing and it might not always work as intended.