i3 has modes which is sets of keybindings enabled as you press the key to enter the mode. Tapping right shift enters command mode wherein many bindings are avai

i3 has modes which is sets of keybindings enabled as you press the key to enter the mode. Tapping right shift enters command mode wherein many bindings are available but notably hitting o followed by a letter key opens the app bound to the variable $appkey_[letter] To bind b to firefox appkey b firefox to open firefox <rshift> o b If you decide you like chromium better tomorrow appkey b chromium. If you want b to open a longer command appkey b "some long command here"