ReminderFox alternative for Opera.

[G-CPTN]

For years Firefox was my preferred browser, and I have used ReminderFox as my 'diary', however RF doesn't work with FF57 and I have to keep rowing back to FF47.
As it happens, my browser of choice is now Opera, and I really only retain FF because of RF (and to read PPRuNe threads from which I have been given the proverbial 'time away' - not a ban).

I am seeking an application that will be as useful and comprehensive as RF that will work on Opera (and will accept my current RF entries if possible).

Any ideas?

Currently on W8 and no intention of changing to W10 until I absolutely have to.

[jimjim1]

I can't recommend software to your requirements however I thought I would mention that many chrome extensions can be used on Opera using -

https://addons.opera.com/en-gb/extensions/details/install-chrome-extensions/

Install Chrome Extensions. by Opera Software. Rating: 4.5 Total number of ratings: 1176. Add to Opera. Install Chrome Extensions allows you to install extensions from Google Chrome Web Store in your Opera browser. You can install extensions only. Themes are not supported.

I use Opera at present too.

[ian16th]

If you are/were FF user, did/do you use Thunderbird as your e-mail client?

If so, you might like to look at the Lightning add on for T-Bird.