3.5.18

* Safely restore tree for reopened tab even if its old parent was already closed. (regression on 3.5.16)
* Safely restore tree for reopened tab on the "Fix up tree structure with visible tabs automatically" mode. (regression on 3.5.17)

3.5.17

* Undo closed tab at its correct old position, even it it was restored as a hidden tab on the startup.
* Update `ru` locale by [wvxwxvw](https://github.com/wvxwxvw). Thanks!

3.5.16

* Drop support for some built-in themes: ["Metal"](https://github.com/piroor/treestyletab/wiki/Metal-theme) and ["Plain Dark"](https://github.com/piroor/treestyletab/wiki/Plain-Dark-theme-%28patch-for-the-theme-%22Plain%22%29). They can be alternated with [user styles](https://github.com/piroor/treestyletab/wiki/Code-snippets-for-custom-style-rules#restore-old-built-in-themes).
* Fix too dark color for active tabs from combinations of the Dark color scheme and a bright theme.
* Apply a workaround for a problem: [unreadable text color on the "High Contrast" mode of Windows 10](https://bugzilla.mozilla.org/show_bug.cgi?id=1656637).
* Respect tiling option specified by the browser theme, otherwise expand the background image as an un-repeatable when the aspect ratio of the image is wider than 4:1.
* Apply system colors on Linux environments by default again.
* Allow to attach restored hidden tab to other hidden tabs.
* Suppress errors around dragging of non-tab data.

3.5.15

* Expand the background image cited from the browser theme to cover the sidebar area, instead of repeating.
* Don't attach restored tab to its old hidden parent when TST is configured to fix trees based on visible tabs.

3.5.14

i* Confirm to close tabs via context menu commands on the sidebar correctly. (regression on recent versions)
* Always apply the "Photon" color scheme on Linux environments.
* Always apply browser's theme to the sidebar (on Mixed, Plain and Vertigo).
* Keep the tab in the root level, when a tab is moved or opened before a root tab. This improves compatibility with the Facebook Container.
* Flexible width input field in the bookmark properties dialog.
* Update `ru` locale by [wvxwxvw](https://github.com/wvxwxvw). Thanks!

3.5.13

* List tabs to be closed/grouped in the confirmation dialog to represent which tabs are going to be operated.
* Update tabs' activated, pinned/unpinned, hidden/shown, and collapsed/expanded states correctly. (regression on 3.5.12)
* Highlight multiselected tabs on "Metal" and "Sidebar" theme correctly. (regression on 3.5.12)
* Restore tree structure for "Undo Close Tabs" operation more correctly.

3.5.12

* Stabilize handling of asynchronously notified messages from the background page to the sidebar page. As the result, wrong indentation and collapsed/expanded state should disappear especially around session restoration.
* CSS selectors for container tabs like `tab-item[data-contextual-identity-name="Personal"]` is now available for user styles.

3.5.11

* Show confirmation for multiple tabs closing after a tab is completely closed from outside of TST instead of showing before the tab disappears, for better response on tab closing.
* Ignore click on the blank area if it is performed immediately after a click on a tab and at the same coordinates.
* Add ability to import/export user styles.

3.5.10

* Show fonts with normal weight on Windows 7 Classic theme.
* Define default keyboard shortcuts statically with the `manifest.json`. It should reduce unexpected disappearing of default shortcuts. You can unbind default shortcuts on Firefox 74 and later, but it is impossible on older versions.
* Don't produce any scrolling for popup menus (on the new tab button and others) if the focused item is already visible in the view area.
* Update `ru` locale by [wvxwxvw](https://github.com/wvxwxvw). Thanks!

3.5.9

Constantly promote tab by drag and drop after its present parent tab. (regression on recent versions)