Hi James, your post definately caught me eye because of the Firth name ...
My Great Great Granny (up through my Mom's mom) was a Charlotte Firth (married Robert Mowat) daughter of Thomas Firth of Scotland (Orkney methinks. Gotta double check again but I think most if not ALL of my Scottish roots are from the Orkneys. Too many ancestors to keep track of and remember all the individuals

) and Eliza Boucher. I wonder if our Firth's are connected?

If your relatives are connected back through HBC to Orkney (?) then there is a good chance we're connected
Karmen