I recently downloaded Thunderbird 52.5.0 and now every time I open Thunderbird every folder on my desktop get duplicated on my desktop as a ".sbd" or ".smf" file. I can drag these duplicate .sbd and .smf folders to the trash but they reappear each time I open Thunderbird. I have already trashed and re-downloaded Thunderbird a second time to no avail. I am working on an older 08 Macbook Pro using El Capitan 10.11.6. I am upgrading to a new 2017 Mackbook Pro and want to know if this problem will persist on my new Mac with an updated operating system. Or will the new software eliminate these duplicates.