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Apps with 'Pop-up reminders' feature

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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • Waterfox
    • Pale Moon
    • Thunderbird
    • Firefox
    More
    ReminderFox displays and manages lists of reminders and ToDo's. ReminderFox makes sure you remember all of your important dates via easy-to-use lists, alerts, and alarms, right in your browser without the need for a separate calendar program.

    Discontinued

    The developers announced that the extension will be no longer updated because it's not compatible with Firefox 57 and later. The extension still works on XUL-based Firefox forks like Waterfox and Pale Moon