, I suggest it might be worth adding
"seamonkey" immediately before "netscape". This is the integrated bundle of HTML viewer and mail client which supercedes Netscape.

It's probably not necessary to add "iceape" and "iceweasel" which are rebrandings of Seamonkey and Firefox since they'll be found by xdg-open which was introduced at about the same time. Similar point probably applies to Google Chrome.