Hacker News Reader

verdandion All extensions disabled due to expiration of intermediate signing cert

Type about:config in the address bar and search for 'app.normandy.enabled' flag.

verdandion Shutting Down Google+ for Consumers

And in subsequent years they've done everything to hide this feature from the users and make it much harder to access (it used to be on the left navigation bar, now it's under 'Friend lists' (which also has been renamed at least twice) and also it disappeared from the mobile app)