I've used it for quite a while, and I often visit new web sites. I don't have the time to research what domains are asking for permission, so I usually just click "temporarily allow." But some sites, especially newspapers, come back with even more, and often I don't get to see the content I want unless I hit "allow." I started using Chrome to look at newspapers as this got to be so bothersome. I still like using Firefox, though, because it has some features that Chrome does not. I haven't had any problems so far using Chrome, so either Avast is doing the script protection, Chrome is doing it, or I've just been lucky to not have visited any sites with malicious code.