We are thrilled to share an important development milestone for Thunderbird 114: Firefox Sync is up and running! 
Email, Calendar, and Contact syncing works without issue so far.
We still have work to do, but we're looking forward to making Firefox Sync available through Thunderbird Beta in a few months.
(By the time it hits Beta, we should be syncing most of your Thunderbird settings, too.)
You'll never lose your Thunderbird profile again!
:dontpanic_nobg: 
looks like a good idea to me by the way. But I'd love to see FF and TB perhaps allow sync through a custom service so people aren't forced to use someone else's server for their data - a lot of us would probably love to run our own sync server and set FF/TB up to sync to that instead of Mozilla's servers.
(next someone will tell me that's already possible by compiling the code in repo and adjusting a config parameter...)
Food for thought anyway
Yeah... err... ignore my entire last paragraph
https://github.com/mozilla-services/syncstorage-rs
#shouldHaveReadBeforePosting
@thunderbird The big question is, how secure that backup is? E2E?
@thunderbird Are there plans to also sync RSS feeds?
@thunderbird Where was this in 2003 omg hehe
@LaCrecerelle Well, in 2003 Firefox was still called Phoenix and "the cloud" wasn't even a concept yet...
@thunderbird sounds amazing! Will it also sync my gpg keychain?