When I open GMAIL in the firefox browser on my MacBook Pro, GMAIL then becomes unresponsive. I then open another tap and go to a different website to see if the browser works properly, which it does. I close Firefox then reopen, then log back into GMAIL and the same problem occurs again. Why is this happening and how can I fix it? Thank you, Thomas ''edited by a moderator to remove an email address and a phone number - personal data which doesn't belong in an open forum such as this''