User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_8; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.125 Safari/533.4 Build Identifier: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5; rv:2.0b2) Gecko/20100720 Firefox/4.0b2 The application launches but no window opens. The view menu is greyed out. I an create new tabs and they will be listed in the window menu, but I cannot open a new window nor can I get the browser window displayed. Live bookmarks home page seems to load in the background. I can open the error console. I suspect the problem to be related with a faulty chrome or addon (see error-console snippets) but after the add-ons are now managed in a browser tab, there is no way to change the chrome using the interface. Reproducible: Always Steps to Reproduce: The application did work after install and it is unclear what event has caused this problem, only I did close the application, and the problem occurred at next launch. 1. Launch application Actual Results: No window Expected Results: Browser window From the error console in order of appearance: While creating services from category 'profile-after-change', service for entry 'nsUpdateServiceStub', contract ID '@mozilla.org/updates/update-service-stub;1' does not implement nsIObserver. No chrome package registered for chrome://flashblock/content/flashblock.css While creating services from category 'parser-service-category', could not create service for entry 'Meta Charset Service', contract ID '@mozilla.org/intl/metacharset;1' Warning: Expected ':' but found 'both'. Declaration dropped. Source File: http://www.locolomo.org/css/core.css Line: 201 Error: not well-formed Source File: http://www.reuters.com/ Line: 13, Column: 18 Source Code: <title>Business & Financial News, Breaking US & International News | Reuters.com</title> Error: no element found Source File: http://www.scientificamerican.com/xml/rss.cfm?type=global Line: 1 Error: gBrowser is null Source File: resource://gre/modules/HUDService.jsm Line: 1428 Error: gBrowser is null Source File: resource://gre/modules/HUDService.jsm Line: 1428 Warning: WARN addons.updates: Error: Missing updates property for urn:mozilla:theme:{47e5a66c-0e35-11dc-8314-0800200c9a66} Warning: WARN addons.updates: Error: Missing updates property for urn:mozilla:theme:{972ce4c6-7e08-4474-a285-3208198ce6fd}

This bug was reported using a pre-release version of Firefox 4. Now that Firefox 4.0.1 final has been released, can you please update and retest your bug? A fresh profile would be a good starting place to test, http://support.mozilla.com/kb/Managing+profiles. If you continue to see the issue, can you please update this bug with your results? Filter: firefox4prebugsunco

If you still see this problem when using a current version, please post new information