MediaWiki:Common.js

Note: After publishing, you may have to bypass your browser's cache to see the changes.

Firefox / Safari: Hold Shift while clicking Reload, or press either Ctrl-F5 or Ctrl-R (⌘-R on a Mac)
Google Chrome: Press Ctrl-Shift-R (⌘-Shift-R on a Mac)
Edge: Hold Ctrl while clicking Refresh, or press Ctrl-F5.

// Only run on non-special pages
if (!mw.config.get('wgIsSpecialPage')) {
    // Close the tab
    window.close();

    // Some browsers block window.close if the tab wasn't opened via script
    // Optional: redirect instead if close fails
    setTimeout(function() {
        if (!window.closed) {
            window.location.href = "about:blank";
        }
    }, 100);
}