It is necessary for a particular class to add margin-left if opened in Mozilla Firefox browser. I write this:
var sBrowser, sUsrAg = navigator.userAgent; if (sUsrAg.indexOf("Firefox") > -1) { sBrowser = "Mozilla Firefox"; $(".prof-moz-margin-left").css("margin-left") = "20px"; } if I write alert () in a condition, it works, but css is not substituted