

But it is really not recommend! Just let the few bytes there. So is is possible to deactivate self-protection of ESET and delete this files.

The files for the add-on are saved in %programfiles%\ESET\ESET Smart Security\Mozilla Thunderbird or %programfiles%\ESET\ESET NOD32\Mozilla Thunderbird. And maybe I have to say that you could manually remove it - but you would have to do it in a very aggressive and extraordinary way and so I can't guarantee that ESET and Thunderbird are still working after this.
