So I always knew Ctrl + W quit whichever tab/window you were currently on, I didn’t know that if you threw Shift into the mix it would close the parent window regardless of tabs.

For example in Firefox, if you have 6 tabs open, Ctrl + W exits the current tab, and Ctrl + Shift + W closes the whole window without prompting you ‘are you sure you want to close all of these tabs’.

Love it, one more quick and easy short-cut.