Reminderfox 2.1.6.1 is out, it's a maintenance release with some important fixes.
First it works again with Google Calendar. But the main reason for this release was a great necessity to follow Mozilla changes after Firefox 57 (Quantum). Mozillas moved to new technologies and removed old, mature technics, parts they don't need anymore for Firefox Quantum etc..
Those changes have not only impact on Firefox but also on Thunderbird and Seamonkey. Reminderfox 2.1.6.1 is following changes which are recommended by the Thunderbird development team and can be seen here [1]. Tests with Firefox up to release 56 and Thunderbird up to version 60 show not problem to successfully work with the new release.
Not for every of the Mozilla changes there are sufficient
solutions to keep all of our Reminderfox features, so for sure
some users will find in some ways the release has limitations
compared with previous versions.
Reminderfox made use of the statusbar with some fancy options, but with the recent Mozilla changes it was not possible to keep it alive with all those bells and whistles. Showing "Today's Reminders" on the statusbar has changed to show with the Foxy toolbar button (which is customizable for different FX/TB toolbars) only. That mode was available before already.
But for the Reminderfox statusbar feature (showing "Today's Reminders") there are some possibilities to bring it back (partially), pending on the system (Firefox, Thunderbird or Seamonkey) and their version.
Works with Firefox 52.6.0 / 20180118122319
https://addons.mozilla.org/de/firefox/addon/the-addon-bar/
the_addon_bar_restored-3.2.9-compat-fixed-4-fx.xpi
- A more complete solution would be a Reminderfox code change which have to build/enable a kind of addon-bar and then place a special icon with the "Today's Reminders" on that.
So if someone is keen to use it there are solution .. up to contribute to the Reminderfox code base which can be found on GIT [2]. A solution for that could be merged easily there.
[1] https://wiki.mozilla.org/Thunderbird/Add-ons_Guide_57
[2] Github: https://github.com/neandr/reminderfox