The full icon set (all sizes required for building) can be downloaded by running the "install.sh" script in this directory.
Note that this does not affect the build of the app which uses resources located in ../OnionBrowser/Images.xcassets/
If you are interested in editing the icon, the source file is available:
https://d2p12wh0p3fo1n.cloudfront.net/files/20120408/Icon.pxm (6.9M, Pixelmator format)
Available under the Creative Commons BY-SA 3.0 license: https://creativecommons.org/licenses/by-sa/3.0/
See LICENSE in repository root for full license information and information about original source photographs.