Firefox by default handles all tabs the same way. A tab gets closed if a user presses the close button, no matter if that action was intended or not. It is also true that new websites get loaded in the active tab under certain circumstances which is another thing that some users might want to avoid in certain situations. The PermaTabs Mod add-on for the Firefox web browser can make tabs in the web browser permanent so that they cannot be closed by normal means. The default setting disables the right-click close tab button, nullifies the action of the close tab icon at the end of the Firefox tabbar and ignores the close all other tabs command for permanent tabs. In short, it makes it impossible to close the tab unless the permanency of it is disabled beforehand.

The permanent tabs are loaded automatically when starting Firefox with the difference that their contents are loaded when the user first accesses the tabs in the tabbar. Permanent tabs can be displayed in a different color to make their identification easier for the user. New permanent tabs can be added by right-clicking a tab and selecting the Permatab option from the menu. This is also the way to undo the action so that the tab once again behaves like any other tab in Firefox.
The PermaTabs Mod is a great way to add indestructible tabs to the Firefox browser which should be interesting for users who work with the same basic set of websites all the time. It could for example be used to protect services like Gmail, Google Search or an individual website from being closed accidentally. The Tab Mix Plus add-on can protect tabs as well but some users might prefer a solution that is not coming with such a huge feature set.
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Why not just name it the “Woot off” tab :P
kind of useless if you already have TMP (tab mix plus)
kind of useful if you do not :)