You’re surely connected to the web site whose handle is proven in the address bar and also the relationship hasn’t been intercepted.
That’s not American English - it’s a literal translation of your Italian phrase. It works, but doesn’t seem very idiomatic to me. whet
A padlock by using a crimson strike over it indicates which the connection in between Firefox and the web site is possibly sent using an insecure protocol (HTTP) or that it is only partially encrypted since you've manually deactivated mixed content material blocking.
That’s not American