I see this in Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040620, but not in the build from 20040619. If I use Customize Toolbar to remove the "Location" field from the toolbar, the Menu Bar and the "Customize..." command become grayed out for the rest of the session. After a restart of Firefox, the Menu Bar and the "Customize..." command are activated again, but the Bookmark Toolbar Items are gone from the toolbar. Using "Customize..." to add the "Location" field to the toolbar, will again deactivate the Menu Bar and the "Customize..." command, but after closing and restarting Firefox again, all is well.

*** Bug 257558 has been marked as a duplicate of this bug. ***

I can reproduce this in 2004-09-07-07-0.9. Mozilla/5.0 (Windows; U; Win 9x 4.90; ja-JP; rv:1.7.3) Gecko/20040907 Firefox/1.0 PR (NOT FINAL) I got error message in JavaScript console: > Error: this.urlBar has no properties > Source File: chrome://browser/content/browser.js > Line: 3379

Maybe related with Bug 224182, Bug 247603 and Bug 252432.

also bug 261811

Fixed by the patch in bug 247603. *** This bug has been marked as a duplicate of 247603 ***