I really enjoyed this until I realized it saves the sites you toggle even while in a private browser. If I'm in a private browser, I don't want anything saved. I don't care if I have to manually toggle the modes every time I open Firefox, I do not want my history saved in any way and this unfortunately does that. I even removed it and reinstalled it and it saved the old sites I had visited. Manually removing them is a pain. If this hiccup can be fixed, it'd be an easy 5 stars but my privacy concerns majorly knocked it down.