It was a prompt to restart Firefox. I've never had problems updating Firefox either but I've had a few other odd things happening recently.
Quite honestly, I think whatever is going on with all the computers is from Facebook. I've received several bogus emails from friends there, although I don't think I've actually gone to any of the links but one (it was the first) and it was a Viagra ad
I do currently run Spyware Doctor and have had no issues with it over the past 3 years.
Many of the bookmarks I had were transferred from IE, guess it's possible to recover some of them from there
