Is this the version that kills Live Bookmarks? Some of us FF old-timers are hopelessly reliant on these things, and it's, as far as I have found, the fastest way to quickly scan lists of headlines from all your favorite sites at once. Seriously, one click and you can quickly mouse over the sites on your bookmarks toolbar to consume hundreds of headlines.
I really, REALLY hate that they're killing this feature, but this addon promises to restore it: https://www.ghacks.net/2018/07/30/livemarks-restores-live-bo...
Edit: here's the official GitHub: https://github.com/nt1m/livemarks/