It would be a shame if the Harriet Tubman telescope exploded on the pad. 10 years in todays pace is a thousand years when you only get a one time shot at it.
If anyone but SpaceX has their mitts in the works I would not place any bets on this thing making orbit.
Webb, an international program led by NASA with its partners ESA (European Space Agency) and the Canadian Space Agency, will launch on an Ariane 5 from Europe's Spaceport in French Guiana on the northeastern coast of South America. ESA is providing the Ariane 5.
Re: "Orbit"
No Earth orbit.
It is going to a Sun-Earth Lagrange Point about 1 million miles from Earth.
It does technically orbit the Lagrange Point. Perhaps that is what you meant?