Whether you want to jump quickly to your profile (Alt + i), check your Facebook inbox (Alt + 4) where you can draft a new message (Alt + c), mark a message as unread (Alt + r), or archive a message (Alt + Delete); the below cheat sheet has got it all.
There are two major facts to notice here: The first one is that you can at anytime ‘show’ the keyboard shortcuts by just pressing (Alt + q) at anytime while on Facebook, the second issue to keep in mind, is that the most used action – and ultimately shortcut- on Facebook, the “Like” action/button is not on the cheat sheet, but here it is for you; while you are on Facebook with any photo open, just press the “L” letter on the keyboard and there you go!
In conclusion, OS differ from one another and from browser to browser, below are the guidelines to keep in mind while using the cheat sheet below.
Firefox: Shift + Alt + #
Chrome: Alt + #
Firefox : Control + #
Chrome: Control + Option + #
Safari: Control + Option + #