It does not show problems if it considers the webpage unsafe, it prevents saving files from certain webpages, with no manual prevention of this, it even prevents saving of files which are pictures or pdfs and so on. Most of the time it's useless.
Edit: it prevented me from downloading a simple .docx file from Discord, it's trash.

no funciona; sí funciona en otros browswers, por ej. IE o Chrome PERO NO EN FIREFOX

it is not possible to add exceptions for sites and if you are allow to go to a blocked page anyway, he asks for each link again and cancels downloads from this page you have allowed, wooow, damn addon

it seems it blocks nearly each site which adult content

no exceptions possible, so removed, bye norton :P

Worthless, will block non malicious sites, and cancel downloads for reason...
Don't waste your time...

Way too many false positives for "known dangerous sites". It happened today, and two days ago would not allow me to log onto my OneDrive account even though I had been on it within the past 30 minutes. Will not use again.

This add-on breaks websites. But Symantec nags you to re-install it if you disable it. A horrible add-on. Chumpware.

Garbage tool, not useful but required to be enabled or norton shows as at risk

Sadly it's something that gives the user NO CHOICES!

Sie verunmöglicht mir den Zugriff auf das Babbel-Sprachprogramm > also schlecht!

Since Norton Safe Web was updated on March 11, 2019, I cannot log onto my bank accounts at CapitalOne.com. I have to first disable Norton Safe Web in order to log onto my account at CapitalOne.com. This is bad!

It asked whether I wanted to change home pages. It did so while I was busy, and so I accidentally clicked outside of the yes/no dialog box. It then took over my search. And the search results through this app were horrible. So I removed it. What I want is ratings on Google's own search, not for the app to take over my home button.

Norton safe web work good in chrome, but its nightmare in firefox. Its eating your RAM. Dont use it until Norton fix this add on.

Firefox grinds to a halt with this add-on enabled because it chews up my 16GB of RAM. Websites refuse to load or take forever to load. It brings my PC to a halt where I can't do anything.

With Safe Web 3.1.0.9 performance has become miserable. Pages frequently take 5 to 10 seconds to load. It can also take as long for *anything* to happen when clicking a link.
Please fix this immediately or I'll have to remove it!

It used to be amazing in the past!
But now it's slowing down the browser TERRIBLY !!!!
And it still has lots of false positives which leads to block a lot of websites that has nothing wrong with them!
And the websites that actually has problems it doesn't block them all... So after years of using it I'm finally removing it.
Waiting for "Windows Defender Web Protection" for Firefox. Just like when I replaced Norton Security with Windows Defender last year.

Slowing down browsing a LOT, and privacy policy is atrocious. And worst, your Norton install will constantly hound you if you don't have it installed.

do not no if it working