Silent Firefox addon install

[Minister]

Good day,

I am creating a small trojan and encountered one problem. The trojan installs an addon for FF and the problem is - FF notifies user about it, spitting out window with "New addons installed". Any ideas how to bypass it, at least a hint, please? I've googled it and searched in Mozilla support forums, but for obvious reasons, nobody is keen on answering it

[Loki]

And for obvious reasons, it wont be answered here.