Modifier keys are specified as <c-x>, <m-x>, and <a-x> for ctrl+x, meta+x, and alt+x respectively. For shift+x and ctrl-shift-x, just type X and <c-X>. See the next section for how to customize these bindings. Once you have Vimium installed, you can see this list of key bindings at any time by typing ?. Navigating the current page: ? show the help dialog for a list of all available keys h scroll l