Sublime Text and Firefox on my Macbook use <kbd>Ctrl</kbd>+<kbd>Tab</kbd> (similar to Geany's keybinding to switch tabs in random/MRU order), and <kbd>Ctrl</kbd>+<kbd>Shift</kbd>+<kbd>Tab</kbd> for going backwards. Would probably be a useful Mac-specific default for people using the crippled built-in laptop keyboards.