To repeat, when i click a link in osx, two firefox windows open. One contains the link I intended to open, and the other displays my set homepage. This has happened on my old iMac and when I migrated to my new iMac back in April. I just purchase a new MacBook Pro and decided to do a completely fresh install of what I needed for portability use. I did however use Firefox Sync to load everything that I have in Mozilla (bookmarks, add ons...) the same on both computers. After that the two windows opening started happening again. So I'm sure it has to be something simple that I need to change which was also synced to this new machine. Can anyone help?

Thank you in advance