Comments:
Please bring back the tab close button when there is only one remaining tab.
The previous behavior of opening a (untitled) blank page works for me.
Alternatively, you could provide an option in the Tabs Preferences to
allow the user to define what page to open when the last tab is closed.
From URL: http://hendrix.mozilla.org/
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Important:
Also go into about:config and change
browser.tabs.closeWindowWithLastTab to false.
/* Add tab-close-button to last tab*/
.tabbrowser-tabs[closebuttons="alltabs"] > .tabbrowser-tab >
.tab-close-button { display: -moz-box !important; }
.tabbrowser-tabs:not([closebuttons="noclose"]):not
([closebuttons="closeatend"]) >
.tabbrowser-tab[selected="true"] > .tab-close-button { display: -moz-
box !important; }