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Developer comments

## Similar projects

*Tree Tabs:
Cross-browser, more powerful features, and high customizability.
(One large difference between TST is: the design strategy.
TST is aimed to keep it simple and work together with other addons as possible as it can.)
*Sidebery:
Another tree addon with powerful features.
* Tab Center Reborn:
Vertical tab bar without tree.
* sidebarTabs:
Vertical tab bar with grouped tabs.

There are more similar projects by someone not me, for Firefox or Chrome. Please try them if TST does not perform as you expected.

## Public API for other addons

For addon authors, Tree Style Tab provides public API. If your addon provides extra context menu items for context menu on tabs, you can easily support TST's context menu with small changes. For more details, see the API document.

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Notas de prensa para 4.2.2

4.2.2 (2025.6.9)
* Pinned tabs are rendered with expected position after rearranging by drag-and-drop. (regression at 4.2.0)
* Apply designed colors always for the "Sidebar" skin, even if the "Dark" color scheme is active. (regression at 4.2.0)
4.2.1 (2025.6.7)
* Scroll to the active tab correctly with disabled animation mode. (regression at 4.2.0)
* Detect sidebar position automatically even if the window is in a screen placed leftside of the primary screen.
* Scroll to the new active tab and keep it in the viewport more correctly even if there are going-to-be-collapsed and/or sticky tabs.
* API: a scroll type message now accepts a new parameter group to scroll the tab bar to the specified tab group.
4.2.0 (2025.6.2)
* Drop support of Firefox older than 139.
* Add support of native tab groups feature of Firefox itself. TST will create a new tab group of Firefox itself instead of modifying tree, when you drag a tab to the head side edge of another tab.
* Show muted state indicator and sharing state indicator (for microphone, camera and screen) at the position same to the one on Firefox's native tab.
* API: Some notification type messages (ex. tab-mousedown) can contain Firefox's tab groups as a tab (tree item). They have properties similar to regular tabs but there is one difference: they have "group" as the value of their type property.

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