goDoCommandの実体を調査。 global/resources/content/globalOverlay.js function goDoCommand(command) { try { var controller = top.document.commandDispatcher.getControllerForCommand(command); if ( controller && controller.isCommandEnabled(command)) controller.doCommand(command); } catch (e) { dump("An error occurred executing the " + command + " command\n" + e + "\n"); } } というのがdoCommandで実行してる。 キー定義は拡張勉強会で教え