The Tor Browser is a cross-platform portable Tor client integrated with a browser (based on Firefox Extended Support Release). It is 100% FLOSS software and includes privacy-related extensions like Privacy Badger and NoScript out-of-box.
Ranked in these QuestionsQuestion Ranking
Pro Tor sets the standard for safe and private browsing
If you follow their instructions religiously, Tor is the nec plus ultra in terms of safety and privacy. For the time being at least.
Pro Access hidden .onion sites
Can be installed and run on a portable device such as a USB stick.
Pro Relatively fast
Con Must adapt new browsing habits
It is not recommended to do several things TOR browser that users would want to do in a normal browser, such as visiting social networks and banking.
Con Extremely slow
Caused by the tor network the browser depends on.