MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

/* Rename Main Page tab */

if (wgPageName == 'Main_Page' || wgPageName == 'Talk:Main_Page') 
    addOnloadHook(function () {
        var nstab = document.getElementById('ca-nstab-main')
        if (nstab && wgUserLanguage=='en') {
            while (nstab.firstChild) nstab = nstab.firstChild
            nstab.nodeValue = 'Main Page'
        }
    }
)