I had another extension that reverted FB to the old design, plus a lot of other customizations, but it stopped working to revert the design just the other day, even though most of the other functions still work just fine.

Well, I'm not the only one who finds the new design unusable, so I am very happy to have found this extension. Thanks so much. I thought I was going to have to give up Facebook.

Update Nov 18, 2020. Seems to have stopped working for me sometime in the past couple days. I uninstalled and reinstalled it, but It doesn't work for me anymore. I see a 5 star review from just 3 hours ago, so it's still working for someone I guess.