>an event that occurred 5 years ago, was immediately rolled back after launch, and hasn't happened again.
It shouldn't have happened in the first place so no one gets any points for taking it down immediately. The fact it doesn't seem to have happened again also earns no points because again it should never have happened in the first place. At no point should your web browser silently install an addon/extension without your permission. That this same web browser wants to trot around afterwards and prattle on about how secure and open they are makes it even worse.