'JustCloud' appears at startup
In recent days, every time I start up my computer this appears, even though no browser opens at startup:
I ran the AdwareMedic application, but that did not find anything. I have an application called WeatherMan which is set to open at startup, so in case that had somehow become infected I reset my System Preferences so that WeatherMan does not open, but the JustCloud thing still appears. How can that be, when I have no browser open?
I should be most grateful for any advice.
Mac mini, OS X Mountain Lion (10.8.5)