Yes we tested with Firefox IE Chrome, Win 7 Win 8.1 and XP
None of them blocked that website at all with Web Scan enabled.
Because no two computers are alike in the world, its very possible your particular PC is only having the issue with this website.
There are so many variables that could contribute to the issue It impossible to tell you what it could be.
Changes to default settings in browsers, add-ons to browsers can complicate things.