User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.3a1) Gecko/20100208 Firefox 3.6 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.3a1) Gecko/20100208 Firefox 3.6 Firefox is very customizable , but one cannot hide list all tabs button and new tab (+) button. Not all users want such features and it would be better that users dont mess up with the Chrome css or about:config to disable them. Reproducible: Always Steps to Reproduce: 1.Right click on navigation bar 2.Click customize 3.Try to disable new tab button/list all tabs button Actual Results: Unable to disable/hide above mentioned buttons Expected Results: Should be hidden by either dragging or click a check mark kinda option in customize dialog