You will now find the group in the new drop-down menu that appears on the right-hand side of the title bar under an arrow ...
Firefox has long supported profiles, but its new management system makes it's much easier to create and switch between them.
There are several steps you can take to get rid of a virus on an infected Mac computer. Here's a guide with methods and advice for every Mac user.
You can easily block a website on Firefox — but you'll need to download the Block Site extension first.