You can use this feature in Firefox.
You simply have to add one of the following links to your browser's toolbar, or add it to your browser's favorites/bookmarks.

Steps

1. Right-click one of the link and point to “Bookmark This Link…”.
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2. Select the folder Bookmarks Toolbar to add the EasyBook bookmark to your bookmarks toolbar. Click “OK”.
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3. Result, once added in the Bookmarks Toolbar:
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After that, you can use the link to automatically add any site that you're viewing directly to your GetBoo account.

Since these links depend on JavaScript, you browser must be enabled to support it.
Also, if you use the pop-up option, you will need to configure your pop-up blocker to allow it.