Sometimes it is little things that can make a big difference. When it comes to closing tabs in the Firefox web browser, users have options to close the tab with a click on the x icon that is either displayed on the right of the tab or at the end of the tabbar. They can alternatively right-click on the tab and select Close Tab from the context menu, or use the keyboard shortcut Ctrl-w to close the active tab.
Double Click Close Tab is an add-on for the Firefox web browser that adds additional tab closing options to the browser. A double-click on a site in the tabbar closes that tab automatically in the browser. While that’s more convenient than using the right-click context menu it is not the most efficient option that the extension provides.
Closing tabs by moving the mouse to the tabbar to either double-click or click on the x icon is inefficient because of that initial mouse movement. The keyboard shortcut works directly but can only close the active tab.
Double Click Close Tab adds two additional tab closing options to Firefox. Users can alternatively triple left-click anywhere on the page to close the active tab. This may interfere with some actions in the browser, for instance double-clicking on text to highlight it. If you click three times instead of two, which can happen, you’d inadvertently close the current website instead.

The options of the add-on provide preferences to change the default behavior. Both the default tab clicking and on page clicking behavior can be altered there. Alternatives are a single middle-click, double right-clicks or triple right-clicks.
It is furthermore possible to disable one of the tab closing options completely, and to change the triple click time (that is the time in which three clicks need to be registered).
Double Click Close Tab can be downloaded and installed directly at the Mozilla add-on repository.
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You can also use the middle mouse button to close tabs by default.
There is another wat to close tabs : middle-click on the tab, without any extensions ;)
What about middle klick..?
You can select middle-click as well.
Middle-click doesn’t close tabs for me.
I meant when you install the add-on.
TabMix Plus has double-click close built-in.
I don’t have any special extensions installed and middle click has always closed tabs for me, going all the way back to like Firefox 4.
As for me, it’s better to close tab with down-right mouse gesture – and this doesn’t interfere with mouse clicks :)
Agreed, using mouse gestures it’s my favorite way to close tabs; I even have gestures to close all tabs except the active one, close right tabs and close left tabs.