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.
(NOTE: The extension displays some optional ADs. If you don't wish to support me, you're welcome to disable it in the settings.)
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.