Assegnate 5 su 5 stelle

This is my main add-on ! I coudl not express myself without :)
And it works well

But a few days ago each smiley insertion raises a "blocked loading file into the message" warning and i need to manually unblock each smiley each time.
This might be a thunderbird version change or an unvolontary mistake on my side.
How can we avoid this, please ?

Regards