These answers for the transition from the 2.4 Tor Browser Bundle to the 3.x series have been moved to the FAQ.
The 3.x series has a number of changes:
- They are built using Firefox version 24.
- Reproducible builds enable anyone to create a byte-for-byte identical copy of any bundle package.
- A Firefox extension called Tor Launcher replaces Vidalia.
- Where did the world map (Vidalia) go?
- How do I verify the download (sha256sums.txt)?
- How do I use pluggable transports?
- Why does "New Identity" close all my open tabs?
- How do I configure Tor as a relay or bridge?
- Why are the file timestamps from 1999?
- Where is the source code for the bundle? How do I verify a build?