3.8.9

* Apply appearance matching to sidebar position (left or right) automatically by default. After you switch the siderbar position, you need to reopen TST's sidebar panel to apply  matching apperance.
* Introduce an expert option to allow detach dragged tab from the window even if it is dropped near the sidebar, for people using `privacy.resistFingerprinting`=`true`.
* Better tree restoration on browser startup, if the delay to detect duplicated tabs is configured for recent versions of Firefox.
* Better compatibility with addons which reopen the initial tab of a new window immediately (e.g. Temporary Containers).
* Import and export all configs more safely with sanitization of device specific config keys.
* API improvement: introduce new notifications [`tabbar-overflow` and `tabbar-underflow`](https://github.com/piroor/treestyletab/wiki/API-for-other-addons#when-the-tab-bar-becomes-scrollable-or-unscrollable).
* API improvement: [`scrolled` notification](https://github.com/piroor/treestyletab/wiki/API-for-other-addons#messages-notified-by-mouse-wheel-rotation) now provides new property `overflow` indicating overflow state of the tab bar.
* Update `ru` locale by [wvxwxvw](https://github.com/wvxwxvw). Thanks!