import json, webbrowser

from osgeo import gdal, gdal_array

ds = gdal.Open("/vsicurl/http://landsat-pds.s3.amazonaws.com/L8/225/071/LC82250712015212LGN00/LC82250712015212LGN00_B4.TIF")

jsInfo = gdal.Info(ds, format='json')

ds = None

jsExtent = jsInfo['wgs84Extent']

js_to_geojson_io = {
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": jsExtent
    }
  ]
}

v_json = json.dumps(js_to_geojson_io)

print v_json

url = "http://geojson.io/#data=data:application/json,{0}".format( v_json )

webbrowser.open( url )  # Open geojson.io