Rated 1 out of 5 stars

Despite showing up as connected and everything, I don't see any signature being imported or used when I make a new mail. It's currently useless.

This review is for a previous version of the add-on (3.1.0). 

Hey, it sounds interesting. Are you sure that you create new email using the same identity as set in the add on? I'd suggest clicking on the "Sync" button and then verifying in the Thunderbird settings, if the account has using signatures enabled, and which identity was synchronized. If the add-on synchronized your signature, it is normally visible in Thunderbird settings. Be aware sometimes you can have a few identities for one account.

Feel free to report bug on Github - you could attach a screenshot of your settings there as well