0.19.2017031101 * Works on lately Firefox versions. (Tested on Nightly 55.0a1.) * Drop support for Firefox 51 and older versions. * Introduce a new choice "No control" as the position of new child tabs. If you choose the option, new child tabs from links will be opened like Firefox's default behavior. * Introduce a new choice "Click" as an action to show shrunken/collapsed tab bar. * Treat child tabs opened by the preference `browser.tabs.insertRelatedAfterCurrent`=`true` more correctly. * Fix broken configuration UI for the "auto hide delay". * The position of the tab bar is now changable again by drag and drop. * Collapse the dragged tree while dragging. The experimental "shrink" behavior in the previous release was removed. * Open new blank tab as next sibling tab correctly, even if the current tab is in a last tree. * Restore children tabs correctly when a parent tab is restored by "undo close tab" command. * Fix visual erros in the "Vertigo" skin. * Avoid fingerprinting by website authors. * Added Greek translation by Vangelis Skarmoutsos. Thanks! * Known issue: opened or expanded tabs sometimes stay invisible until you move the mouse cursor on it, due to [Firefox 52's bug](https://github.com/piroor/treestyletab/issues/1202). This doesn't happen on Firefox 53 and later. Simple workaround is disabling of tab animations by `browser.tabs.animate`=`false` in `about:config`.