About once a week or more, a very small FF icon will appear on my desktop after startup. It will have a string of letters under it, like this one: hqWyUevN . I have never clicked on these things and always pitch them into the trash bin. But I do wonder what it is, what it means, and if it's a security issue of some sort. Please speak slowly and use simple words. I'm not all that tech savvy. Thanks!