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New Tab Button on Tab Bar is a Firefox Extension.

You can download it from the Firefox Add-Ons site.

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After installing this extension, you’ll see the following button in the very left corner of your Tab Bar.:

 

 

Clicking on this button will create a brand new tab.

You will notice, however, that your Tab Bar will always be visible…Even when only one page is open.

If this bothers you, it can be changed.

Just go to the top of your browser and click Tools > Options:

 

 

Make sure that you’re in the “Tabs” section.

Uncheck the box labeled “Always show the tab bar”:

 

 

Now when only one page is open, the Tab Bar will remain hidden.

However, when you have multiple tabs open, the “New Tab” button will still appear.