3.8.22

* [Now you can search bookmark folder items incrementally by key inputs, on the bookmarks folder chooser UI.](https://github.com/piroor/treestyletab/issues/3077)
* Better auto-sizing of the dialog for confirmation of closing tabs.
* Match appearance of multiselected tabs in the Proton theme to Firefox 99's one (follow to changes introduced at [the bug 1751807](https://bugzilla.mozilla.org/show_bug.cgi?id=1751807)).
* Don't open dialogs as modal, on the debug mode.
* API improvement: Add a new notification message type [`try-collapse-tree-from-other-expansion`](https://github.com/piroor/treestyletab/wiki/API-for-other-addons#suppress-unintentional-collapsion-of-expanded-tree-by-tst) to block collapsion of tabs from expansion of another tree.

3.8.21

Accept dragged items from TST Bookmarks Subpanel 1.2.4 and later.

3.8.20

* Fix odd behaviors around drag operations on Firefox 97 and later.
* Inherit container from the active tab to new tabs more safely by reopening, without losing their URL.
* Accept double quotations in tab titles for a bookmark title.
* Don't expand tree by long-press of the Ctrl key, when Ctrl-Tab handling is not granted.
* Show "gear" favicon for "about:config" tabs (follow-up of a change on Firefox 98).
* Update `de` locale by [SammysHP](https://github.com/SammysHP). Thanks!

3.8.19

* Show tabs with readable background color on the combination of "High Contrast" theme and the dark color scheme of Windows 10, on Firefox 96.0 and later.
* Update `ru` locale by [wvxwxvw](https://github.com/wvxwxvw). Thanks!

3.8.18

* Keep TST's sidebar page loaded in regular tabs even if tabs are dropped on some situations, for example a combination with [Tree Style Tab in Separate Window](https://addons.mozilla.org/firefox/addon/tst-in-separate-window/) and TST's option to deactivate tab detaching.
* Add a secret option to deactivate sync configs across devices via Firefox Sync (TST's options => Development => All Configs => `syncEnabled`). This was introduced for a workaround about [high CPU usage problem triggered by sync](https://github.com/piroor/treestyletab/issues/3057).

3.8.17

* Attach tabs sent from other devices to the tree correctly, even if they are sent while the receiver Firefox is not running and `browser.tabs.insertAfterCurrent` is `true`.
* Put a set of tabs from other device together in a place instead of jumped positions if possible, when `browser.tabs.insertAfterCurrent` is `true`. (Set a secret option `fixupOrderOfTabsFromOtherDevice` to `false` when you want to deactivate the behavior.)
* Respect the right-to-left mark at the beginning of a page title.
* Better appearance of the counter for collapsed descendant tabs in the Sidebar theme.
* Don't collapse tree by double-click on tab closeboxes. It accidebtally collapsed the closing tree and closed all descendant tabs unexpectedly.
* Treat middle-click and accel-click actions on the "New Tab" command in the context menu on tabs same to actions on the "New Tab" button, in the sidebar.
* `<tab-item-substance>`, `<tab-label>` and `<span class="label-content">` now inherit `data-tab-id` and `data-window-id` attributes from the parent element (`<tab-item>`) for more customizability with custom user styles.
* Highlight tabs with "attention" class same as Firefox's native tabs even if they are not faviconized.
* Use highly-visible (darker) background certainly with the "High Contrast" theme on Linux.

3.8.16

* Fade-out long tab labels to left or right, only based on the direction of the label text themselves instead of a global option.
* Remove an option to set global text direction of tab labels.
* Update `ko` locale by [OctopusET](https://github.com/OctopusET). Thanks!

3.8.15

* Apply container information saved by [Container Bookmarks](https://addons.mozilla.org/firefox/addon/container-bookmarks/) correctly for tabs opened from a bookmark folder by the "Open All as Tree" context menu command.
* Collapse tabs dropped onto a collapsed tree correctly, when the drop target parent tab is kept collapsed by TST Lock Tree Collapsed.
* Add a secret option to deactivate API for other addons: `APIEnabled`
* Update `zh_TW` locale by [SiderealArt](https://github.com/SiderealArt). Thanks!

3.8.14

Apply given colors to the toolbar button icon, menu icons and the sidebar header icon, if the theme provides rich information (ex. Colorways of Firefox 95 and later).

3.8.13

* Fix unexpectedly invisible children when a parent tab is restored and collapsed tabs are re-attached to the restored parent.
* Outdent tab via API correctly when a child tab is outdented to the root level with its descendants.
* Update `zh_CN` locale by [NightSharp](https://github.com/NightSharp). Thanks!