Tor, a hunk in fox skin, uses Firefox with ultimate anonymity weapons. The most private tool in browsing arsenal which nobody would want you to discover, ever!
With Tor browser, you enter and leave the web with no marks for anyone to find you. It is seriously most private browser in the world. It is not loaded with shiny features but only privacy oriented tools.
Government and security bodies hate it. Hackers love it. And better not to admire Tor anymore. Some people call it illegal web browser to explore deep web and dark web.
Whatever, Tor is the ultimate browser for most private browsing. It has a built-in VPN which hides your privacy all around the Internet. Nobody can know your real location because your actual location is not visible due to VPN.
Tor might feel sluggish sometimes. It is due to privacy and VPN overload. Moreover, it may block flash content and videos. There are ways to unblock video on Tor but those are tedious methods. It is better to use some other browser if you want to enjoy videos or flash based online games.
Tor browser is not a smooth web browser. You cannot compare it with Firefox, Chrome or Edge. It is not made to surf the web like others. The major purpose of this software is privacy protection and secure browsing first. This is the top priority and Tor does not care if anything else breaks on the price of ultimate online privacy.
Caution
Be careful if you use Tor browser. Do not expose it in general public. It is better unpin it from taskbar and remove its icon from desktop. If people find you using Tor browser, you might be considered as a hacker. You can be suspected for illegal activities or cyber crime. Tor is not for everyone, so avoid using without a legitimate reason.