Fixed bookmark/session editor input showing black background on dark themes
Added UI settings config reset in config panel

Added support for Firefox container and tab groups - visual labels
Improved lazy loading model - use firefox native lazy loading instead of custom implementation
Improved options config - added slim/wide scrollbar option

fixed possible bug where auto-saved history could be deleted
added lazy-loading bookmark fix (troubleshooting panel)
added option to close active tabs using drag-n-drop

Greatly improved RAM usage for history auto-save (Firefox storage bug)
History saving now keeps track of closed windows
Fixed several visual bugs

Improved UI initialization - fixed potential issues with buttons not working properly
Added option to toggle FaviconService

- added support for drag-n-drop active session tabs into saved sessions
- new option: reverse tab restore order
- added context menu for Session-List
- bugfixes: favicon-service, open edit menu on window save, homepage initialization

Added lazy-loading session restore. Defaults to On but can be turned off in addon settings
Added bookmark favicon caching (based on tab favicon url)
Initial support for tab-management in active tab (arrange tabs using drag-n-drop or move between windows)
Improved tutorial - added information about session export/import options
Improved configuration (custom click/middle click action and custom shortcuts for addon Tab and Window View

removed favicon service

fixed initialization procedure (root bookmark creation) when using different localized version of Firefox with
improved UI responsiveness

fixed restore bug for multi-window sessions when restoring in new window
fixed bookmark saving order (tabs were saved in reverse order and when restoring the session tabs would have been in reverse order)
general user experience improvements

Version 3.0 brings support for WebExtensions API
- general UI improvements to fit all the UI into the limited size widget
- ability to detach the UI into a tab/separate window with support for any screen size

Starting with Firefox 60 access shortcut can be changed from the configuration menu. Current support: Firefox Beta, Firefox Developer Edition, and all future versions