Bug 807817 - Dump Marionette logs as well as writing to logfile, r=philikon, a=NPOTB

testing/marionette/components/marionettecomponent.js

@@ -23,6 +23,7 @@ function MarionetteComponent() {
   
   let formatter = new Log4Moz.BasicFormatter();
   this.logger.addAppender(new Log4Moz.FileAppender(logf, formatter));
+  this.logger.addAppender(new Log4Moz.DumpAppender(formatter));
   this.logger.info("MarionetteComponent loaded");
 }