A while back I reported the loss of my 'diary' of forthcoming events when Firefox updated itself and ReminderFox was incompatible with that version - result was utter panic by me as I no longer knew what my busy programme of activities involved.
I (eventually) restored the situation by uninstalling FF and downloading and installing an earlier version.
The same happened today as FF helpfully updated itself to the latest version - alas without ReminderFox.
Can anyone suggest a replacement for ReminderFox that will, perhaps, work with current versions of Opera (my current choice of browser)?
The only add-on that I can find apparently only works on versions 11 and 12.