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Open Tab Count is a Firefox Extension.

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

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This extension displays the number of open tabs that you have. For example, let’s say you have 5 open tabs in your Firefox browser. You can see the count in your status bar:

 

 

Now let’s say that you open another browser window. In this new window you have 2 open tabs.

The tab count will now look like the following:

 

 

It shows that you have 2 open tabs in the current window, out of a total of 7 open tabs when you add the two windows together.