RC1-release. Please bump! 0.9.91 (2017-10-01): - reworked toolbars: -- added support for visibility toggle button (collapsing contents); -- fixed unified toolbar and titlebar style under macOS; -- toolbar visibility and location is now stored per main window; - improved sidebar(s): -- added ability to add new sidebars; -- allow to change their location by drag and drop; - vastly improved error pages: -- special error pages are now used instead of SSL warning dialogs; -- blocked content triggers dedicated error pages; - improved User Agents configuration; - added support for managing multiple proxy configurations and setting them per page or host; - reworked internal actions handling system allows to specify parameters for actions trigerred by keyboard shortcuts and mouse gestures; - vastly decreased import time for large bookmark files; - added module for listing opened windows and tabs; - improved styling under Windows, Unity and macOS; - added new default icon theme by Kamil Nęcek; - item views can now allocate extra space to predefined column other than last one; - added action to set, reset or toggle an option; - global editing actions now apply to focused single and multi line text edit widgets too; - added ability to drop URLs onto bookmark bars; - spell checking is now available in other multi line text edit widgets; - added action to control multimedia playback rate; - keyboard shortcuts are now validated while editing; - added support for customizing F12 menu; - implemented "Validate Using" menu; - added support for configurable Fast Forward rules; - lots of various fixes.