Rated 4 out of 5 stars
This is a great add-on. Working great with TB 78 so far. Only issue is that signatures need to be created and stored inside TB and managed necessarily from within the add-on. There are no more signature files saved in the program's Signatures folder. So if you wnat to save / backup your signatures you must remember to create .txt (or .html) files and save them appropriately.This review is for a previous version of the add-on (2.3.0).
Rated 5 out of 5 stars
I love SS and have used it for years on two Windows 7 pc's.
Now I have installed Thunderbird and SS on a new Windows 10 pc.
All is fine, never had a problem with it, except when I exported TB from one computer to another without updating the signature files path in the new computer. The signatures appeared 'grey' (non-selectable) when composing a new message.
It was my fault. Updating the file path everything went fine.