TC 14.10 do not work with Mozilla Firefox 69.0.1

In my case TC 14.20 is broken as Support is also getting the same issue . 

So I moved back to TC 14.10 but the problem is we have upgraded to Mozilla Firefox 69.0.1 

Now TC 14.10 cannot work on Mozilla Firefox 69.0.1 

How can we support Mozilla Firefox 69.0.1 ?