In vertical tabs, add a close button.

[mcoyle1960]

In vertical tabs, add a close button. Currently, you need to either second-click to close contextually, or Control-W which requires two fingers and is not a comfortable command to hit.
Give us a little X in the upper right corner, even if it makes the icon a tad larger.

[Jon]

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[Casper042]

If you all on the FF team simply added a X Close Tab option to the Customize list of commands, then we can simply put it wherever we want it.

In Vertical mode when the sidebar is shrunk, it definitely takes more work than it should to close a tab.

For me adding a close tab button between the Home/back buttons and the address bar would be perfect.