User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.1) Gecko/20061010 Firefox/2.0 Build Identifier: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.1) Gecko/20061010 Firefox/2.0 upon launch, selecting "error Console" from the Tools menu reveals this every time "Error: Warning: unrecognized command line flag -psn_0_137101313 Source File: file:///Applications/Firefox.app/Contents/MacOS/components/nsBrowserContentHandler.js Line: 576" Reproducible: Always Steps to Reproduce: 1. Launch Firefox (either latest 2.0 RC 3 or previous 1.5.0.7 for regression) 2. Using Tools -> Error Console (on 2.0) or "JavaScript Console (1.5.0.7) see error 3. Click on line and look at code, but I don't readily see the issue Actual Results: The home page shows fine, so it's not immediately obvious how seriously the error affects the behavior of running Firefox. Looks fine to me by all at cursory level

*** This bug has been marked as a duplicate of 304755 ***