MediaWiki:Common.js

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$(document).ready(function() {
    // Check if the user is not logged in
    if (mw.config.get('wgUserName') === null) {
        // Hide the tabs for anonymous users
        $('#ca-history').hide();
        $('#ca-view').hide();
        $('#ca-viewsource').hide();
        $('#ca-login').hide();
        $('.login-link-class').hide(); 
    }
});