Did you plan to do a Thunderbird add-on?

[lakano]

Hello,

I love DecSync, it's a clever idea!
A Thunderbird extension could be simpler, also for all theses new immutable GNU/Linux distributions (OpenSuse Aeon/Kalpa, Fedora Silverblue, ChromeOS ...) where the apps are in flatpak package and the base system is in read-only.

I'm not sure if it's technically possible, I've checked the API here:
https://developer.thunderbird.net/add-ons/mailextensions/supported-webextension-api

There is an API to create/delete/update addressbook:
https://webextension-api.thunderbird.net/en/latest/addressBooks.html

And the possibility to attach the WebExtension as the provider
https://webextension-api.thunderbird.net/en/latest/addressBooks.provider.html

But I haven't found anything about the Calendar.