The problem is not limited to Mailplane and is reproducible with every available browser access to Gmail (Chrome, Firefox, Opera and Safari) on several Macs. I

The problem is not limited to Mailplane and is reproducible with every available browser access to Gmail (Chrome, Firefox, Opera and Safari) on several Macs. I am wondering if this issue is limited to our Mac setup or if other users are affected as well. Most users would probably never notice since even if you use a personal firewall, you usually grant your browser full Internet access on the relevant ports.