javascript-set-homepage

gistfile1.js

function setHomepage(url) {
    if (document.all) {
        document.body.style.behavior='url(#default#homepage)';
        document.body.setHomePage(url);
    } else if (window.sidebar) {
        if (window.netscape) {
            try {
                netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
            } catch(e) {
                alert("Cannot set homepage deu to browser permissions. Enter website manually or if you wish to enable this functionality, enter about:config in your address bar and change the value of signed.applets.codebase_principal_support to true");
            }
        }
        var prefs = Components.classes['@mozilla.org/preferences-service;1'].getService(Components. interfaces.nsIPrefBranch);
        prefs.setCharPref('browser.startup.homepage',url);
    }
}