2.4.10 * Match default behavior of long-press on the "New Tab" button to Firefox's one (it shows a menu to choose container). * Place button to select new tab posiiton at right side for the new tab button, if the button to choose container is invisible. * Respect `browser.tabs.selectOwnerOnClose` correctly when new child tabs are configured to be inserted to top of tree. (regression on 2.4.9) * First child tab opened from a pinned tab is now placed at configured position. (regression on 2.4.9) * Process initialization message from other addons via API more correctly. * Better performance around dragging something over tabs. * Better performance around collapse/expand tabs.