For the past couple of weeks or so I have NOT been able to reply to messages in my Hotmail/Outlook account. I have two computers, i.e., one PC (Windows 7) and an iMac. The problem exists on my PC, but NOT on the iMac. I am using the latest version of Firefox, 44.0. When I'm in my Hotmail account I press the "Reply" and/or the "New" button and nothing happens. This happened once a few years back (I'm a long-time Firefox user) and it was resolved, but I don't recall how. This is very frustrating! I use the two computers for two distinctly different purposes and I'm experiencing other problems with Firefox on the PC which are not present on the iMac (which I reported in a different category, as it's related to losing open tabs).