This Firefox add-on makes you work easy by not typing on the address bar to go to Gmail or few clicks by getting it from your bookmarks. This add-on lets to go to Gmail by just clicking the button. Here are some simple steps on how to get this,
Search for this text in Google – Open Gmail in new tab – Toolbar Icon – Firefox 4 – and click on the link which will take you to the Firefox add-ons page and do the usual process of adding this to your Firefox browser.
When you are done with this, this might need a restart of the browser and you can see the Gmail button on the top of your browser (as shown in the screenshot below). Just click that button to go to your Gmail page. For more on how to install this add-on watch this demo – http://www.youtube.com/watch?v=cB9XFdDIue8