Makes Gmail™ your default email app (original ext repackaged without toolbar button, with safer links & working 'copy address')
Makes the Gmail™ webmail your default email application.
Some pages include clickable email addresses (mailto: links). By default they open in a mail application like Outlook Express. This extension makes sure they open in Gmail instead (if you don't see the point, take a look at craigslist), without adding any extra buttons. It also works on javascript-created links.
You can also add an "Email this" command to the right-click menu. Ctrl-Shift-M will open Gmail to send the current page. These can be configured in the options pane.
Note: You might need to reload Chrome for the extension to get effect.