* Fix for issue where many tabs causes close button to overlap other tabs (LP: #1473630) * When page has started, stopped, redirected or errored clear cache for history update - which prevents incorrect titles in being set (LP: #1603835) * Add autopilot tests javascript dialogs to webbrowser and webapp-container - alertDialog, beforeUnloadDialog, confirmDialog and promptDialog (LP: #1633040) * Add user-agent override to display the new twitter mobile interface (LP: #1577834) * Improved startup time by 800ms by delaying QML compilation and making it asynchronous * Replace chromium version in UA overrides at runtime, not at build time (LP: #1599695) * Initial support for generating a snap package for webbrowser-app (LP: #1629009) * Do not persist references to incognito downloads on disk (LP: #1625519) * Increase test coverage (to 97.5%) for DownloadsModel (LP: #1534102) * Various performance optimizations linked to load events (LP: #1611680) * Ensure a tab is loaded when re-opened (LP: #1632246) * Fix drag'n'drop of bookmarks within the new tab view (LP: #1584868) * Work around a limitation in the sound and microphone policy groups to "fix" sound in yakkety an zesty (LP: #1632620)