Pretty scummy
If they wanted to promote their tools they could have popped up a 1-shot welcome / advertorial to that effect. Conning people into install things they never wanted is just low. Not just regular people, but those most likely to be riled by an intrusion into their privacy. I'm glad to see the project has almost instantly branched. I hope Mozilla get in on the act and suspend the orinal add on before any more damage can be done.