No Close Buttons

Firefox 57 and later

Firefox 57 and later do not support_ any API to make this extension work. If you prefer your browser tabs without close buttons, you can make it work by adding a custom userChrome.css file to your Firefox profile:

#. Find your profile folder_ #. Create a directory called chrome inside it if one does not already exist #. Create a file named userChrome.css in the new directory #. Add the following CSS code to it:

.. code-block:: css

  @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
  .tab-close-button { display: none !important; }

#. Open "Advanced Preferences" by typing about:config in the address bar. #. Search for toolkit.legacyUserProfileCustomizations.stylesheets and set it to true. #. Restart Firefox

History

In Firefox 31, the browser.tabs.closeButtons option was removed. This restartless addon forces what previously used to be a value of 2 for that option: no close buttons on any tabs.

.. _do not support: https://bugzilla.mozilla.org/show_bug.cgi?id=1392589 .. _profile folder: http://kb.mozillazine.org/Profile_folder