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|User since||April 3, 2008|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
Not very useful as is. Would be better if we could select profiles or tweak the user-agent.
Right now it's more just a quick visual help to see what you are doing, but not useful to really develop sites on a wide range of devices.