Strange coordinate system

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Here's an extract of a feature from the web that I converted to geojson using qgis. However, the coordinates are not standard are at all and when trying to actually preview it on the web it fails, however, qgis has no problem reading it. My question is how do I transform this set of coordinates using QGis into "standard" coordinates. Data comes from here http://donnees.ville.montreal.qc.ca...resource/c38ea3f0-fa70-48c9-9421-92113c581b69

{ "type": "FeatureCollection", "crs": { "type": "name", "properties": { "name": "urn:eek:gc:def:crs:EPSG::900913" } }, "features": [ { "type": "Feature", "properties": { "categorie": "rural" }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ -8232754.718677375465631, 5691987.542297831736505, 0.0 ], [ -8232826.554151621647179, 5691863.061614270322025, 0.0 ] Here is the prj file

PROJCS["Ontario_MTM_Zone_8_east_of_75_degrees_W_NAD_83_datum",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["Geodetic_Reference_System_of_1980",6378137,298.2572221008916]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-73.5],PARAMETER["scale_factor",0.9999],PARAMETER["false_easting",304800],PARAMETER["false_northing",0],UNIT["Meter",1]]

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