PLEASE NOTE:
  Tor Launcher is built into Tor Browser, and it may be built as a
  XUL/XPCOM extension for use with TorBirdy.  You should not install
  and try to use it in Mozilla Firefox or another Firefox-based browser.

OVERVIEW
Tor Launcher is a browser extension that starts the tor process
(which connects the browser and other applications to the Tor
Network), and Tor Launcher helps people configure and use Tor. The
first window that you see when you start Tor Browser is displayed
by Tor Launcher.

BUG TRACKER
Tor Launcher bugs and enhancement requests are tracked using the
Tor Project's Trac system. Open the following link to view a list
of open tickets:
  https://trac.torproject.org/projects/tor/query?status=!closed&component=Applications%2FTor+Launcher&order=id

SOURCE CODE
The main Tor Launcher Git repository may be cloned by using either
of these URLs:
  https://git.torproject.org/tor-launcher.git
  http://dccbbv6cooddgcrq.onion/tor-launcher.git

A browsable view of the code is available via:
  https://gitweb.torproject.org/tor-launcher.git

The main development branch is master, which is currently used for
the hardened Tor Browser releases. Maintenance branches are used
for other product releases; e.g., maint-0.2.10 is a branch that is
used for releases in the Tor Browser 6.5 series.

BUILDING TOR LAUNCHER
Official builds that use the Tor Launcher code are done as part of
a larger application build process. For example, look here for
information about the Tor Browser build process:
  https://trac.torproject.org/projects/tor/wiki/doc/TorBrowser/Hacking

CONTACTING THE DEVELOPERS
To contact the Tor Launcher developers, use the #tor-dev channel
on irc.oftc.net or post a message to the tbb-dev mailing list (see
https://lists.torproject.org/cgi-bin/mailman/listinfo/tbb-dev).