|User since||March 29, 2013|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
In a little more detail...
StumbleUpon Rated 2 out of 5 stars
StumbleUpon takes over the hotkey Ctrl+Shift+N which is incognito mode for firefox. There is no option to change this, which is awful.
The websites aren't terribly random (if you look at other stumblers likes you'll see that the vast majority of websites are seen by everyone, so its more like an app that automatically sends you to trending websites)