TST Lock Tree Collapsed is a specialized addon designed for users of Tree Style Tab versionand later, enhancing the tab management experience in Firefox. This addon addresses the common issue of frequent tab expansions, allowing users to lock parent tabs in a collapsed state. By simply double-clicking on a parent tab, users can prevent unwanted expansions during various actions, streamlining their browsing experience.

As a subscription-based tool, TST Lock Tree Collapsed offers a practical solution for those who prefer a tidy tab organization. Originally a built-in feature in earlier versions of Tree Style Tab, this functionality has been separated into its own addon for improved usability. This addon is particularly beneficial for users who manage numerous tabs and seek to maintain a clean and organized workspace.