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Tab Counter is a Firefox Extension.

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

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This extension will display the number of tabs you have open in your Firefox browser.

After installation, just look to the top-right corner of your browser to see the number:

 

 

If the top-right corner is not the ideal place for you, the counter can always be moved.

Just go to View > Toolbars > Customize:

 

 

Then left-click on the counter and drag it to another spot. In the example below, I’ve placed it next to the Home button:

 

 

There are no further customizations at this point.