Do the following.
1. Close JMR and firefox and any other browser you have
2. In "Type here to search" enter Inetcpl.cpl and then enter
3. On the Internet Properties applet that appears go to Connections > LAN settings > Advanced delete all the ws://* and wss://* from the "Do not use proxy server for addresses beginning with" text box and then OK out to close.
4. Open JMR and go to Settings > Internet Downloads > Advanced > HTTP > Reinstall FireFox HTTPS Monitor.
Once that is done and if you are still having issues then please provide debug logs again.
From CRS @ 05 Sep 2017 12:09