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Vertigo is a Firefox Extension.

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

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This extension changes your tab layout from the default horizontal view (see below):

 

 

…to a vertical view:

 

 

Below is a screenshot of Vertigo’s Options Window. The developer makes note that there may be a conflict if you have Tab Mix Plus installed:

 

 

I highlighted the “Tab Bar Splitter” for you below. It can be dragged left or right to better display the name of the tab:

 

 

Finally, here is a screenshot of the Close buttons; should you decide to make them visible: