Perhaps the best way is to install an old browser version just for using the web transceiver.
but honestly with portable nodes, iaxrpt, the phone portal, sip connections, echolink, etc. why do we really need it. I can count on one hand the times I have used it in four years and then only to play. It never worked that well anyway. Its like Echolink, it uses the computer mic and speakers and its quality is only as good as those are which often is not very good. Most everyone now has a smart phone. From it you can ssh into your node and use iaxrpt, echolink, or other sip application for voice. You could also build a "radioless" portable node that uses your phone as a hotspot or add a radio for extended range.
If a user wants to try out Allstar or connect to an Allstar node to talk to a buddy they could use Echolink by connecting to the many nodes that support it.
My vote for what it counts would be to take it off
allstarlink.org altogether. If something is not there no one can complain about it not working!