I have two homes in different states. Both have Mac computers. I would like to have both Firefox and Thunderbird be the same on both with the same files and same bookmarks, passwords etc. I now go into the Library and copy files to a thumb drive when I am at home, and bring the thumb to my cabin. My problem is that I do not know which specific files to copy and bring and replace. Can someone please inform me which files to copy for a seamless transition between both machines? Thank you.