Safari can create a New Tab by clicking in the blank space next to a tab which you don't have until after you use the Command+T option to create a new tab.
Also, the New Tabs that are created do not open with your HomePage but just a blank page until you install my button.
These are the main features and use of this button. Those that are giving it a bad review are not thinking about all of that before posting their bad reviews. This is a feature that has been in Firefox for a long time and I'm bringing it to Safari. Watch the demo video on the Web Site and everything they are addressing is explained.
Now... The missing button in Apple's Safari is here and improved. The "New Tab" button is now a reality. There have been many 3rd party apps that add the tab button but also a lot of other stuff, too. This will only replace your existing "Add Bookmark" button in Safari for 10.5.4 Leopard, with my "New Tab" button and the option of having "New Tabs" open with your HomePage. Nothing else, it's simple and small and Works Great.