After updating to FF 10 many features do not work anymore

After updating to 10.0, several features suddenly don't work anymore: - starting page is not shown when opening a new window - orange menu button shows (according to settings it shouldn't) - bookmarks bar doesn't show though selected, after unselect and select again it shows, as well as suddenly menu bar (orange menu button then disappears) - same thing happens with every new window - address bar always shows the last address entered, regardless of the tab content - tabs don't get remembered when closing FF (though according to settings they should) - privacy mode doesn't work, no reaction at all (neither through clicking in extras, orange menu button or using the key combination) - links should open in new tabs according to setting, they always open in new windows - edit: no rss-feeds working All in all, very annoying