One Google account can be used for all services that Google offers. Users can use Gmail for emailing, Google Reader for RSS feeds, Adwords and Adsense for web marketing and monetization, Youtube to upload videos or Google Search to search the web.
The Firefox add-on Google Shortcuts offers to place shortcut icons that link to Google services in a Firefox toolbar so that it becomes more convenient to open the Google websites.
Advanced users might say that this can also be done with bookmarks and they are right but Google Shortcuts is a very convenient way of adding links to Google services in the web browser.

The add-on places the icons that lead to the websites in the navigation toolbar. The icons can be moved into other toolbars easily by right-clicking a blank space in a toolbar and selecting customize.
The add-on’s options can be used to configure the services that should appear in the Firefox interface. It is very easy to add or remove services and even edit the urls of most entries which is handy for foreign users for instance.
The majority of services offered are Google web services but there are also some from Microsoft and a few dummy entries that can be customized by the user.
The options hold display settings as well to change the toolbar layout to a dropdown menu which saves space in the Firefox interface.

Google Apps users can enter their apps domain to make use of that as well.
The links behave the same way as standard links in Firefox. A left-click will open the website in the active tab, a middle-click in a new tab while left-click plus Ctrl-Alt opens the service in a sidebar which is helpful for some services such as Google Contacts.
Google Shortcuts can be downloaded from the official Mozilla Firefox add-on repository.
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Something is useful for me. Thanks