Changing the Title bar with multiple instances of Thundarbird

This is Fedora 22 with Xfce. I run 4 copies of Thunderbird via a script like: export MOZ_NO_REMOTE=1 thunderbird -profile ~/data/htt/Mail & export -n MOZ_NO_REMOTE I have been doing this for years, now I could use the -no-remote option directly, but that is not the reason for this message... All copies of Thunderbird have a title bar that says the folder open and "Mozilla Thunderbird". Since they all tend to be on an inbox folder, the title bars are the same and this makes for a little challenge to figure out which one to switch to. So I am looking for a way to customize the title bar, either within the Thunderbird profile, or within the launching script. Any recommendations? And please don't recommend to run one copy with lots of email accounts. Each copy already has multiple email accounts. There are business reasons for separating them as I do. thank you