hi 
i would like to make suggestions for this extension,
but how to know if developers will see this msg or not ?
yes sorry, i forgot to put the link.
Go to the AMO page I linked to, and follow the link under “More information > Add-on Links > Support site”. Then create a GitHub account, log in and submit a feature request.
I don’t think he will see this thread, because he was last active here in November 2019:
https://discourse.mozilla.org/u/cadeyrn/activity
thank you very much