Just great, allow to check what an extension does before dowloading and install it (well, if you now about coding...).
It should be followed and recommanded by Mozilla !!!
I agree with another comment: it would be great if could show addon-UID.
Thank you to the developper, who to care of answering to the other comment and provided an easy way to get thins info: go to address about:support and see below "Extensions"
