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.