In short, I've been finding this program replacing my Firefox home screen several times (File Sent Suite in this case is the name). I thought ok, it must be my fault that I installed something wrong, but I still haven't installed anything and it appeared again, I uninstall it and know how to remove it, but every now and then it comes back, I've already done a complete check on the system and I didn't find anything wrong, so I don't know where it could be coming from, any ideas?