var {devtools} = Cu.import("resource://gre/modules/devtools/Loader.jsm", {});
var {WebConsoleFrame} = devtools.require("devtools/webconsole/webconsole");

ModuleNotFoundError: unable to satisfy: require(devtools/webconsole/webconsole) from
(thefilename.js)

var {WebConsoleFrame} = devtools["require"]("devtools/webconsole/webconsole");