Salve a tutti e mi scuso se ho violato qualche regolamento del forum è la prima volta che scrivo qui… di recente(esattamente qualche ora fa) ho aggiornato firefox all’ultima versione (43.0.1) e in pratica Firefox mi ha disattivato in automatico( e non posso più attivarlo posso solo rimuoverlo) il componente aggiuntivo " avast online security" e come vedete dallo screen
type about:config in the browser’s address bar then enter.
Confirm you will be careful if the prompt appears.
Search for xpinstall.signatures.required.
Double-click the preference to set it to false.
I apologize for not having answered most sincere I have seen just today your answer (I had not set the mail notification for any replies lol) with your help I managed to solve my problem thank you very much should give her a medal: DThey were days and days I was looking for a solution online but I have never come to the head thanks again and I hope that his response would be helpful to others