Google is always known for making your life easy, now Google has added new options to quick action buttons in Gmail which lets you do certain things without opening mails.
Now Google has added buttons for YouTube and DropBox which means if you get a mail which has Dropbox link then you can open that link without opening mail.
For example if you wish to rate and review a restaurant mentioned in a mail then you can do it directly from ‘review’ button, you can also modify OpenTable reservations by using one shortcut keys, or can save a promotional deal from Google Offers with a single click.
You can open a Dropbox folder or Google Docs, Sheets, and Slides that have been shared with you. There are lots of other shortcut keys in work which you can check on Google Developer site.