Only one Tor Browser logo should be used on Mac OS X in TBB3.0
Starting with TBB 3.0a3 it is possible that two different logos are visible on Mac OS X's dock (not simultaneously though): The TorBrowserBundle_*.app-logo if one e.g. starts TBB via Finder and the "old" TBB logo if one e.g. restarts the Tor Browser from within after an extension update. There should always the same logo get used. Otherwise this might be confusing to users. This issue got introduced by merging stuff of #9173 (closed). Before that only the TBB logo was used.