I am sorry but i don't understand, "get menu but no browser", do you mean that firefox open in a blank page ? with no homepage like google etc ?

if this is happening see in Options window - General panel - Startup and in When Firefox starts scroll and put Show my home page.

thank you

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Try to repair the disk permissions:

• http://thexlab.com/faqs/repairprocess.html
• http://guides.macrumors.com/Repairing_Permissions

• http://support.apple.com/kb/HT2963 Troubleshooting permissions issues in Mac OS X
• http://support.apple.com/kb/HT1452?viewlocale=en_US About Disk Utility's Repair Disk Permissions feature

Try to remove the Firefox plist file (org.mozilla.firefox.plist).

• http://www.macfixit.com/article.php?story=20060606082246983 How .plist files become corrupt and troubleshooting the results

Go to "~/Library/Preferences" and remove the plist file for Firefox (org.mozilla.firefox.plist)

See also:

• http://kb.mozillazine.org/Corrupt_localstore.rdf