1) Quick Tabs is an open-source, customizable extension, that allows you redefine some CSS styles and allows to setup hotkey for switching MRU tabs. Also it supports keyboard navigation (move to next/previous tab). However chrome doesn't let you bind Ctrl+Tab as a keyboard shortcut, so you need to register another one (for example Ctrl+Shift+S) and then use AutoHotkey script to "remap" Ctrl+Tab for chrome into Ctrl+Shift+S.