We all know reminders for tasks, appointments or emails, but truly a great browser should be able to remind me to check out a certain tab or website at a given time. I may find a useful website, but just don't have the time to check it out right now, so I want or need to look at it later. I would like to right-click on the tab, create a reminder, set a date and time and add a short text-note and then get reminded with a push/pop-up in the browser with the option to snooze the reminder. If this would then also remind me on all logged in devices for my Mozilla account, this would be a game changer, because otherwise I have to open a reminder app and add the reminder there which takes a lot more time and effort.