browser based email reply
What this essentially means is that you log on to your email account via your preferred web browser and not an email client or application installed on your pc. So this can be any of those you listed (Firefox, Chrome, Internet Explorer). Open your browser and go to your Internet Service Providers (ISP) home site, many people use gmail (https://mail.google.com/), AT&T (https://mail.yahoo.com/), Comcast (http://xfinity.comcast.net/), and there are many, many others. To find yours, just search your ISP name with "mail" and it should immediately pull back the link to where you can log on. Hope this helps.