Gmail not working with Firefox 52.0

When trying to reply to an email using a portable version of Firefox the reply box pops up, however I am unable to type anything into the box. It acts as if the keypad is dead, has no response.

At first I kept getting a message saying that "this version of Chrome was not supported" by Gmail. This was what was in my Firefox browser window. I then clicked to update firefox and after the update (still Firefox 52.0.*) I am still getting the same results just no longer getting the not supported message any more.

Still unable to reply to any of my gmails using this version of Firefox. This is on my work PC using Windows 7. Hence the reason for using the portable version, not able to install Firefox on my work PC, just using it from my flashdrive.