But actually, this basically turns Firefox into the Google Browser, a program in which your Google account is your master login for all others, and your personal information is now completely detached from your home PC, and is entirely online and accessible anywhere. I am naive, and much more easily excited than concerned.

Firefox’s Extension window is one of the slickest pieces of programming I’ve ever seen. When you open it, Update buttons appear next to anything that has a new version out, and you can click them all straight away and they’ll all update simultaneously, in seconds, without asking you anything or making you click okay or waiting for each other to finish first or looking things up or conflicting or breaking or failing to find things. Extensions are user-created content; it’s extraordinary to see the host program supporting them so dotingly. Even Steam is years off being this clever.