Firefox 移除上方Tab的X
1.輸入 "about:config"2.搜尋 "browser.tabs.closeButtons"，內定值為1，改為2即可
各值代表意義:
0 - Display close button on active tab
1 - Display close button on all tabs
2 - Display no close buttons
3 - Display single close button at end of tab bar (Firefox 1.x)
Reference:
Firefox Hack: Remove Close Button from Tabs
http://desultcreations.blogspot.tw/2007/07/firefox-hack-remove-x-close-button-from.html
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