3.4.9

   * Put bookmarks undar a new folder with their tree structure information automatically, when they are created from tabs via drag and drop.
   * Allow to move down a tree with the keyboard shortcut Ctrl-Shift-PageDown correctly.
   * Don't leave invisible orphans after only their parent tab is moved via drag and drop or other operations.
   * Show the fake context menu correctly even after any helper addon is unloaded.
   * Return root tabs for an API call like `{type:`get-tree`,windowId}` correctly.
   * Notify `try-redirect-focus-from-collaped-tab` and `try-expand-tree-from-focused-collapsed-tab` with correct `focusDirection` for the first time or cases with a circulation.
   * Make tabs visible automatically when tabs are attached/detached via APIs.
   * [Performance improvement around APIs](https://github.com/piroor/treestyletab/issues/2554) by [account-login](https://github.com/account-login). Thanks!
   * Fix typo in English locale by [jaens](https://github.com/jaens). Thanks!
   * Update `zh_CN` locale by [no1xsyzy](https://github.com/no1xsyzy): add an access key for the menu item "Tree of tabs". Thanks!

3.4.8

   * Fix ghost "active, highlighted" state of newly opened tabs which lost its focus imediately.
   * Fix accidental unregistration of helper addons from unhandled errors.
   * Fix invalid `tab` property of `tab-mouseup` and `tab-clicked` notifications on mouseup after moving from non-tab element.
   * Suppress error ater the first regular (unpinned) tab restoration.
   * Better description for drag and drop behavior options.
   * Update `zh_CN` locale by [NightSharp](https://github.com/NightSharp). Thanks!
   * Update `ru` locale by [wvxwxvw](https://github.com/wvxwxvw). Thanks!

3.4.7

   * Fix undroppability of links and some objects to tabs. (regression on recent versions)
   * Add a link to open the options page itself in a new tab, at the top of the page.
   * Add "Reset All" button to the bottom of the options page.
   * Update `de` locale by SammysHP. Thanks!
   * Update `ru` locale by wvxwxvw. Thanks!

3.4.6

   * Add "Collapse this Tree Recursively" and "Expand this Tree Recursively" commands for the context menu and keyboard shortcuts.
   * Support inverted actions of some context menu commands with middle click: reload tree / reload descendants, close tree / close descendants, collapse tree one level / recursively, and expand tree one level / recursively.
   * Support multiselected tabs by some context menu commands: reload tree, reload descendants, close tree, close descendants, close others except the tree, collapse tree, and expand tree.
   * Add "Collapse this Tree Recursively" and "Expand this Tree Recursively" commands for the context menu and keyboard shortcuts.
   * Add an expert option to control the behavior when the current tab is closed with collapsed descendants and hidden sidebar.
   * Change the default behavior around closing tab without sidebar to "for people who use the native tab bar". It was unexpectedly overwritten by the auto migration mechanism.
   * Add a new option `recursively` to [`collapse-tree`](https://github.com/piroor/treestyletab/wiki/API-for-other-addons#collapse-expanded-tree) and [`expand-tree`](https://github.com/piroor/treestyletab/wiki/API-for-other-addons#expand-collapsed-tree) APIs.
   * Add a new paremter `button` to parameters notified to `fake-contextMenu-click` listeners.
   * Update `ru` locale by wvxwxvw. Thanks!

3.4.5

   * Better compatibility to Firefox's native tabs around behavior and user experience about Ctrl-Click and Shift-Click on UI elements in tabs (twisties, sound playing buttons, and closeboxes). Now these actions just changes multizelection state of tabs.
   * Better compatibility with the combination of [TST Lock Tree Collapsed](https://addons.mozilla.org/firefox/addon/tst-lock-tree-collapsed/) and [TST Active Tab in Collapsed Tree](https://addons.mozilla.org/firefox/addon/tst-active-tab-in-collapsed-tr).
   * Add a new API notification message type: [`try-redirect-focus-from-collaped-tab`](https://github.com/piroor/treestyletab/wiki/API-for-other-addons#suppress-unintentional-focus-change-by-tst).

3.4.4

   * TST's tab is activated on a mousedown event. This behavior was unexpectedly lost at TST 3.1.0. (regression)
   * Skip collapsed tree while tab switching via Ctrl-Tab/Ctrl-Shift-Tab, including cases they are lcoked as collapsed by some other helper addons.
   * [`tab-mouseup` and `tab-clicked`](https://github.com/piroor/treestyletab/wiki/API-for-other-addons#when-a-tab-is-clicked) are notified even if `tab-mousedown` is canceled. I totally confused the spec about mouse events with key and input events. This fixes incompatibility regression with a helper addon [Move unloaded tabs for Tree Style Tab](https://addons.mozilla.org/firefox/addon/move-unloaded-tabs-for-tst/).

3.4.3

Better compatibility with known custom user styles.

3.4.2

Fix confused color scheme with the "Plain Dark" theme on Linux. (regression on 3.4.0)

3.4.1

Fix unclaickable sound playing indicator problem. (regression on 3.4.0)

3.4.0

   * Remove "Lock as Collapsed" feature. Now it is available as a helper addon: [TST Lock Tree Collapsed](https://github.com/piroor/tst-lock-tree-collapsed)
   * Remove "Tab Drag Handle" feature. Now it is available as a helper addon: [TST Tab Drag Handle](https://github.com/piroor/tst-tab-drag-handle)
   * Remove keyboard shortcut customization UI from the options page, because Firefox ESR68 has it.
   * Show in-content confirmations correctly (regression on lately versions of Firefox.)
   * Toggle muted state of descendants of collapsed tree more certainly.
   * Don't show throbber animation in a blank group tab if tree rendering is disabled.
   * More safe for bookmarks with URLs impossible to be opened by an addon.
   * More safe for non-tab drag data. (regression on recent versions)
   * Add checkbox to grant a permission required to show in-content confirmation.
   * Rename an option `autoExpandOnCollapsedChildActive` to `unfocusableCollapsedTab` and make effective on cases tabs going to be collapsed by collapsing parent tree.
   * Better support for a special favicon about `about:devtools-toolbox` tabs.
   * Add new API message types: [`set-extra-tab-contents`, `clear-extra-tab-contents` and `clear-all-extra-tab-contents`](https://github.com/piroor/treestyletab/wiki/Tab-Extra-Contents-API).
   * Add new API notification message types: [`tab-dblclicked`](https://github.com/piroor/treestyletab/wiki/API-for-other-addons#when-a-tab-is-clicked), [`tree-collapsed-state-changed`](https://github.com/piroor/treestyletab/wiki/API-for-other-addons#when-tree-is-collapsed-or-expanded), [`try-move-focus-from-collapsing-tree`](https://github.com/piroor/treestyletab/wiki/API-for-other-addons#suppress-unintentional-focus-change-by-tst), [`try-expand-tree-from-focused-parent`, `try-expand-tree-from-focused-bundled-parent`, `try-expand-tree-from-attached-child`, `try-expand-tree-from-focused-collapsed-tab`, `try-expand-tree-from-long-press-ctrl-key` and `try-expand-tree-from-end-tab-switch`](https://github.com/piroor/treestyletab/wiki/API-for-other-addons#suppress-unintentional-expansion-of-collapsed-tree-by-tst).
   * Notifications and operations [`tab-mouseup`, `tab-clicked` and `tab-dblclicked` following to `tab-mousedown`](https://github.com/piroor/treestyletab/wiki/API-for-other-addons#when-a-tab-is-clicked) are now canceled by any leading notifications.
   * Don't deliver messages around incognito windows to other addons, if they are not allowed to access incognito windows.
   * Update `ru` locale by wvxwxvw. Thanks!