Shortcut Key in Firefox to Close Tab Quickly

To close the current tab, You Can Do it with Ctrl + F4 (or Ctrl + W, easier access) (not unlike Alt + F4, which closes the whole window)

By default, Mozilla Firefox displays a close button on each tab. Since it is always displayed, it takes a significant place if you have many tabs open. In addition, you may never use it because you know other tricks to close a tab:
Ctrl + W / Apple + W (Mac)
The "middle-click on the tab.

Fortunately, the developers of Mozilla Firefox have implemented a fairly useful setting in about: config: The "browser.tabs.closeButtons".
It can take 4 different values, depending on the setting you want:

* 0 - Display a close button only on active tab.
* 1 - Display a close button on all tabs (default).
* 2 - Do no close button.
* 3 - Display a close button at the end of the tab bar. (My choice)


To change this option, follow the help.

1. Open a new tab in Firefox. (Ctrl + T / Apple + T)
2. In the address bar, type about: config
3. If Firefox asks you to answer that "yes, you care".
4. In the search field, type "browser.tabs.closeButtons".
5. do a right click on the line "browser.tabs.closeButtons" click edit.
6. Enter the value you want, and click OK.
7. Close the tab.